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1. Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector

Author

Centre de Physique des Particules de Marseille (CPPM) ; CNRS - IN2P3 - Université de la Méditerranée - Aix-Marseille II, Laboratoire de Physique Subatomique et de Cosmologie (LPSC) ; IN2P3 - Université Grenoble Alpes - CNRS, Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules (CC IN2P3) ; CNRS - IN2P3, Laboratoire de l'Accélérateur Linéaire (LAL) ; CNRS - IN2P3 - Université Paris XI - Paris Sud, Laboratoire de Physique Corpusculaire [Clermont-Ferrand] (LPC) ; CNRS - IN2P3 - Université Blaise Pascal - Clermont-Ferrand II, Laboratoire d'Annecy le Vieux de Physique des Particules (LAPP) ; CNRS - IN2P3 - Université de Savoie, Laboratoire Charles Coulomb (L2C) ; Université Montpellier II - Sciences et techniques - CNRS, ATLAS, Aad, G., Albrand, S., Brown, J., Collot, J., Crépé-Renaudin, S., Dechenaux, B., Delsart, P.A., Gabaldon, C., Genest, M.H., Hostachy, J.Y., Le, B.T., Ledroit-Guillon, F., Lleres, A., Lucotte, A., Malek, F., Monini, C., Stark, J., Trocmé, B., Wu, M., Rahal, G., Abdel Khalek, S., Bassalat, A., Becot, C., Binet, S., Bourdarios, C., Charfeddine, D., De Vivie De Regie, J.B., Duflot, L., Escalier, M., Fayard, L., Fournier, D., Grivaz, J.-F., Guillemin, T., Henrot-Versillé, S., Hrivnac, J., Iconomidou-Fayard, L., Idarraga, J., Kado, M., Lounis, A., Makovec, N., Matricon, P., Poggioli, L., Puzo, P., Renaud, A., Rousseau, D., Rybkin, G., Schaffer, A.C., Scifo, E., Serin, L., Simion, S., Tanaka, R., Tran, H.L., Zerwas, D., Zhang, Z., Boumediene, D., Busato, E., Calvet, D., Calvet, S., Donini, J., Dubreuil, E., Ghodbane, N., Gilles, G., Gris, Ph., Guicheney, C., Liao, H., Pallin, D., Paredes Hernandez, D., Podlyski, F., Santoni, C., Theveneaux-Pelzer, T., Valéry, L., Vazeille, F., Barnovska, Z., Berger, N., Colas, J., Delmastro, M., Di Ciaccio, L., Doan, T.K.O., Elles, S., Goy, C., Hryn'Ova, T., Jézéquel, S., Keoshkerian, H., Koletsou, I., Lafaye, R., Leveque, J., Lombardo, V.P., Massol, N., Perrodo, P., Przysiezniak, H., Sauvage, G., Sauvan, E., Schwoerer, M., Simard, O., Todorov, T., Wingerter-Seez, I., Alio, L., Barbero, M., C. Clémens, J., Coadou, Y., Diglio, S., Djama, F., Feligioni, L., Hallewell, G., Hoffmann, D., Hubaut, F., B. F. G. Knoops, E., Le Guirriec, E., Li, B., Madaffari, D., Mochizuki, K., Monnier, E., Muanza, S., Nagai, Y., Pralavorio, P., Rozanov, A., Serre, T., Talby, M., Tiouchichine, E., Tisserant, S., Toth, J., Touchard, F., Ughetto, M., Vacavant, L., Centre de Physique des Particules de Marseille (CPPM) ; CNRS - IN2P3 - Université de la Méditerranée - Aix-Marseille II, Laboratoire de Physique Subatomique et de Cosmologie (LPSC) ; IN2P3 - Université Grenoble Alpes - CNRS, Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules (CC IN2P3) ; CNRS - IN2P3, Laboratoire de l'Accélérateur Linéaire (LAL) ; CNRS - IN2P3 - Université Paris XI - Paris Sud, Laboratoire de Physique Corpusculaire [Clermont-Ferrand] (LPC) ; CNRS - IN2P3 - Université Blaise Pascal - Clermont-Ferrand II, Laboratoire d'Annecy le Vieux de Physique des Particules (LAPP) ; CNRS - IN2P3 - Université de Savoie, Laboratoire Charles Coulomb (L2C) ; Université Montpellier II - Sciences et techniques - CNRS, ATLAS, Aad, G., Albrand, S., Brown, J., Collot, J., Crépé-Renaudin, S., Dechenaux, B., Delsart, P.A., Gabaldon, C., Genest, M.H., Hostachy, J.Y., Le, B.T., Ledroit-Guillon, F., Lleres, A., Lucotte, A., Malek, F., Monini, C., Stark, J., Trocmé, B., Wu, M., Rahal, G., Abdel Khalek, S., Bassalat, A., Becot, C., Binet, S., Bourdarios, C., Charfeddine, D., De Vivie De Regie, J.B., Duflot, L., Escalier, M., Fayard, L., Fournier, D., Grivaz, J.-F., Guillemin, T., Henrot-Versillé, S., Hrivnac, J., Iconomidou-Fayard, L., Idarraga, J., Kado, M., Lounis, A., Makovec, N., Matricon, P., Poggioli, L., Puzo, P., Renaud, A., Rousseau, D., Rybkin, G., Schaffer, A.C., Scifo, E., Serin, L., Simion, S., Tanaka, R., Tran, H.L., Zerwas, D., Zhang, Z., Boumediene, D., Busato, E., Calvet, D., Calvet, S., Donini, J., Dubreuil, E., Ghodbane, N., Gilles, G., Gris, Ph., Guicheney, C., Liao, H., Pallin, D., Paredes Hernandez, D., Podlyski, F., Santoni, C., Theveneaux-Pelzer, T., Valéry, L., Vazeille, F., Barnovska, Z., Berger, N., Colas, J., Delmastro, M., Di Ciaccio, L., Doan, T.K.O., Elles, S., Goy, C., Hryn'Ova, T., Jézéquel, S., Keoshkerian, H., Koletsou, I., Lafaye, R., Leveque, J., Lombardo, V.P., Massol, N., Perrodo, P., Przysiezniak, H., Sauvage, G., Sauvan, E., Schwoerer, M., Simard, O., Todorov, T., Wingerter-Seez, I., Alio, L., Barbero, M., C. Clémens, J., Coadou, Y., Diglio, S., Djama, F., Feligioni, L., Hallewell, G., Hoffmann, D., Hubaut, F., B. F. G. Knoops, E., Le Guirriec, E., Li, B., Madaffari, D., Mochizuki, K., Monnier, E., Muanza, S., Nagai, Y., Pralavorio, P., Rozanov, A., Serre, T., Talby, M., Tiouchichine, E., Tisserant, S., Toth, J., Touchard, F., Ughetto, M., and Vacavant, L.

Abstract

See paper for full list of authors - 17 pages plus author list + cover pages (33 pages total), 8 figures, 4 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2012-08, Measurements of charged-particle fragmentation functions of jets produced in ultra-relativistic nuclear collisions can provide insight into the modification of parton showers in the hot, dense medium created in the collisions. ATLAS has measured jets in sqrt(s_NN) = 2.76 TeV Pb+Pb collisions at the LHC using a data set recorded in 2011 with an integrated luminosity of 0.14 nb-1. Jets were reconstructed using the anti-kt algorithm with distance parameter values R = 0.2, 0.3, and 0.4. Distributions of charged-particle transverse momentum and longitudinal momentum fraction are reported for seven bins in collision centrality for R=0.4 jets with pT^jet > 100 GeV. Commensurate minimum pT values are used for the other radii. Ratios of fragment distributions in each centrality bin to those measured in the most peripheral bin are presented. These ratios show a reduction of fragment yield in central collisions relative to peripheral collisions at intermediate z values, 0.04 <~ z <~ 0.2 and an enhancement in fragment yield for z <~ 0.04. A smaller, less significant enhancement is observed at large z and large pT in central collisions.

2. Novel opto-fluidic drug delivery system for efficient cellular transfection

Author

Majid Layachi, Anthony Treizebré, Laurent Hay, David Gilbert, Jean Pesez, Quentin D’Acremont, Kevin Braeckmans, Quentin Thommen, Emmanuel Courtade, Bio-Micro-Electro-Mechanical Systems - IEMN (BIOMEMS - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Universiteit Gent = Ghent University (UGENT), Cancer Heterogeneity, Plasticity and Resistance to Therapies - UMR 9020 - U 1277 (CANTHER), Institut Pasteur de Lille, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille)-Centre National de la Recherche Scientifique (CNRS), CHU Lille, This work is part of the ERC Consolidator grant NANOBUBBLE (2014). This work has been partially supported by the LABEX CEMPI (ANR-11-LABX- 0007), as well as by the Ministry of Higher Education and Research, Hauts de France council and European Regional Development Fund (ERDF) through the Contrat de Projets Etat-Region (CPER Photonics for Society P4S)., Renatech Network, ANR-11-LABX-0007,CEMPI,Centre Européen pour les Mathématiques, la Physique et leurs Interactions(2011), European Project: 648124,H2020,ERC-2014-CoG,NANOBUBBLE(2015), Bio-Micro-Electro-Mechanical Systems - IEMN [BIOMEMS - IEMN], Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM], Laboratoire Charles Coulomb [L2C], Universiteit Gent = Ghent University [UGENT], and Cancer Heterogeneity, Plasticity and Resistance to Therapies - UMR 9020 - U 1277 [CANTHER]

Subjects
Microfluidics, Biomedical Engineering, Pharmaceutical Science, Medicine (miscellaneous), Bioengineering, Applied Microbiology and Biotechnology, Photoporation, PORATION, MEMBRANE DISRUPTION, Medicine and Health Sciences, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, High-throughput intracellular delivery, MICROJETS, LYSIS, NANOBUBBLES, Biology and Life Sciences, [SDV.SP]Life Sciences [q-bio]/Pharmaceutical sciences, Vapour nanobubbles, Microfuidics, Nanoparticle micro-positioning, SIZE, GOLD NANOPARTICLES, CELLS, Molecular Medicine, LASER
Abstract

Intracellular drug delivery is at the heart of many diagnosis procedures and a key step in gene therapy. Research has been conducted to bypass cell barriers for controlled intracellular drug release and made consistent progress. However, state-of-the-art techniques based on non-viral carriers or physical methods suffer several drawbacks, including limited delivery yield, low throughput or low viability, which are key parameters in therapeutics, diagnostics and drug delivery. Nevertheless, gold nanoparticle (AuNP) mediated photoporation has stood out as a promising approach to permeabilize cell membranes through laser induced Vapour NanoBubble (VNB) generation, allowing the influx of external cargo molecules into cells. However, its use as a transfection technology for the genetic manipulation of therapeutic cells is hindered by the presence of non-degradable gold nanoparticles. Here, we report a new optofluidic method bringing gold nanoparticles in close proximity to cells for photoporation, while avoiding direct contact with cells by taking advantage of hydrodynamic focusing in a multi-flow device. Cells were successfully photoporated with $$\sim {70}{\%}$$ ∼ 70 % efficiency with no significant reduction in cell viability at a throughput ranging from $$10^3$$ 10 3 to $$10^4~\text {cells}~{\hbox {min}^{-1}}$$ 10 4 cells min - 1 . This optofluidic approach provides prospects of translating photoporation from an R &D setting to clinical use for producing genetically engineered therapeutic cells.

Published
2023

3. Porous silicon microcavities redefine colorimetric ELISA sensitivity for ultrasensitive detection of autoimmune antibodies

Author

Sathish Kumar Ramakrishan, Vivechana Agarwal, Csilla Gergely, Frédéric Cuisinier, Marta Martin Fernandez, Thierry Cloitre, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb ( L2C ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Materials science, Smart phone, Cost effectiveness, [PHYS.PHYS.PHYS-BIO-PH]Physics [physics]/Physics [physics]/Biological Physics [physics.bio-ph], Nanotechnology, 02 engineering and technology, 010402 general chemistry, Porous silicon, 01 natural sciences, [ PHYS.PHYS.PHYS-BIO-PH ] Physics [physics]/Physics [physics]/Biological Physics [physics.bio-ph], Materials Chemistry, Disease biomarker, Sensitivity (control systems), Electrical and Electronic Engineering, Instrumentation, business.industry, Metals and Alloys, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 3. Good health, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Ccd detector, Photonics, 0210 nano-technology, business
Abstract

International audience; Cost-effective health care technologies for detection of disease biomarkers at ultralow concentrations can significantly improve the quality of life in resource-constrained countries. However, current techniques require expensive instruments, complex conjugation protocols and tedious laboratory procedures that may not be affordable for the major part of the world population. Here, we propose to sidestep the problem by establishing a simple, relatively inexpensive sensing method employing a photonic substrate, a material affinity peptide, and a smart phone CCD detector to achieve detection of clinically relevant proteins in serum at concentrations much lower than standard enzyme-linked immunosorbent assay (ELISA). Easy to process porous silicon (PSi) micro-cavities were employed as substrates that provide a three-dimensionality, large surface area, and convenient light enhancement properties for molecular detection. Anti-histone H2B antibodies and biomarkers of severe illnesses are detected in whole serum at concentrations as low as 10 fg mL−1 by using the proposed PSi-ELISA protocol. Due to its easy use, cost effectiveness and high sensitivity, the proposed method has potential large- scale applications in ultrasensitive sensing of different other clinically relevant molecules for early stage diagnostics.

Published
2018

4. Magnetoabsorption of Dirac Fermions in InAs/GaSb/InAs 'Three-Layer' Gapless Quantum Wells

Author

Christophe Consejo, Milan Orlita, V. I. Gavrilenko, Marek Potemski, Wojciech Knap, V. V. Preobrazhenskii, B. R. Semyagin, F. Gonzalez-Posada, Mikhail A. Putyato, E. A. Emelyanov, Frederic Teppe, Eric Tournié, L. S. Bovkun, Sandra Ruffenach, M. Marcinkiewicz, Benjamin A. Piot, Sergey S. Krishtopenko, A. V. Ikonnikov, Guilhem Boissier, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institute for Physics of Microstructures of the RAS, Russian Academy of Sciences [Moscow] (RAS), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut d’Electronique et des Systèmes (IES), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Institute for Physics of Microstructures, Université du Québec, Laboratoire national des champs magnétiques intenses - Grenoble ( LNCMI ), Centre National de la Recherche Scientifique ( CNRS ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Joseph Fourier - Grenoble 1 ( UJF ) -Université Grenoble Alpes ( UGA ), Institut d’Electronique et des Systèmes ( IES ), and Russian Academy of Sciences [Moscow] ( RAS )

Subjects
Physics, Physics and Astronomy (miscellaneous), Condensed matter physics, Cyclotron resonance, 02 engineering and technology, Landau quantization, Electron, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, 01 natural sciences, symbols.namesake, Gapless playback, Dirac fermion, [ PHYS.COND.CM-MSQHE ] Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Dispersion relation, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, 010306 general physics, 0210 nano-technology, Electronic band structure, ComputingMilieux_MISCELLANEOUS, Quantum well
Abstract

Cyclotron resonance spectra in high magnetic fields up to 34 T in InAs/GaSb/InAs “three-layer” quantum wells with gapless Dirac fermions have been studied. In quantizing magnetic fields, an absorption line associated with transitions from the lower Landau levels of electrons in a subband with a “conical” dispersion relation has been detected. Experimental energies of the transitions have been compared to theoretical calculations with the eight-band Kane Hamiltonian. The results confirm the gapless band structure of the studied samples.

Published
2017

5. Attractor flow trees, BPS indices and quivers

Author

Sergei Alexandrov, Boris Pioline, Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Théorique et Hautes Energies ( LPTHE ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
High Energy Physics - Theory, flow: attractor, Pure mathematics, Betti number, General Mathematics, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], General Physics and Astronomy, FOS: Physical sciences, Context (language use), quiver, 01 natural sciences, supergravity: 2, [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th], Mathematics - Algebraic Geometry, 0103 physical sciences, Attractor, FOS: Mathematics, black hole, Representation Theory (math.RT), Algebraic Geometry (math.AG), Mathematics, 010308 nuclear & particles physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Supergravity, Quiver, quantum mechanics, stability, Moduli space, Automatic Keywords, Flow (mathematics), High Energy Physics - Theory (hep-th), moduli space, BPS, [ PHYS.MPHY ] Physics [physics]/Mathematical Physics [math-ph], Coulomb, Tree (set theory), Mathematics - Representation Theory
Abstract

Inspired by the split attractor flow conjecture for multi-centered black hole solutions in N=2 supergravity, we propose a formula expressing the BPS index $\Omega(\gamma,z)$ in terms of `attractor indices' $\Omega_*(\gamma_i)$. The latter count BPS states in their respective attractor chamber. This formula expresses the index as a sum over stable flow trees weighted by products of attractor indices. We show how to compute the contribution of each tree directly in terms of asymptotic data, without having to integrate the attractor flow explicitly. Furthermore, we derive new representations for the index which make it manifest that discontinuities associated to distinct trees cancel in the sum, leaving only the discontinuities consistent with wall-crossing. We apply these results in the context of quiver quantum mechanics, providing a new way of computing the Betti numbers of quiver moduli spaces, and compare them with the Coulomb branch formula, clarifying the relation between attractor and single-centered indices., Comment: 36+17 pages, 9 figures; v2: figure 4 fixed, to appear in ATMP

Published
2019

6. Integrability, duality and sigma models

Author

A. V. Litvinov, Vladimir Fateev, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb ( L2C ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
High Energy Physics - Theory, Nuclear and High Energy Physics, Sigma model, Integrable system, FOS: Physical sciences, Duality (optimization), algebra: Lie, 01 natural sciences, [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th], Bethe ansatz, sigma model: O(N), field theory: integrability, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Integrable Field Theories, Perturbation theory, 010306 general physics, Mathematical physics, field theory: conformal, Physics, Conformal Field Theory, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], 010308 nuclear & particles physics, Conformal field theory, Computer Science::Information Retrieval, scattering, nonlocal, Renormalization group, 16. Peace & justice, High Energy Physics - Theory (hep-th), lcsh:QC770-798, duality, charge: screening, Scattering theory, renormalization group, Sigma Models
Abstract

We introduce and study conformal field theories specified by W −algebras commuting with certain set of screening charges. These CFT’s possess perturbations which define integrable QFT’s. We establish that these QFT’s have local and non-local Integrals of Motion and admit the perturbation theory in the weak coupling region. We construct factorized scattering theory which is consistent with non-local Integrals of Motion and perturbation theory. In the strong coupling limit the S−matrix of this QFT tends to the scattering matrix of the O(N) sigma model. The perturbation theory, Bethe ansatz technique, renormalization group approach and methods of conformal field theory are applied to show, that the constructed QFT’s are dual to integrable deformation of O(N) sigma-models.

Published
2018

7. Properties of MAPbI3 perovskite layers grown with HCl additions

Author

Wilfried Desrat, Matthieu Moret, Olivier Briot, Antoine Tiberj, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb ( L2C ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
optical properties, Photoluminescence, Materials science, Iodide, Inorganic chemistry, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Halide, 02 engineering and technology, 010402 general chemistry, HCl, 7. Clean energy, 01 natural sciences, MAPbI3, Transmittance, General Materials Science, Electrical and Electronic Engineering, Solubility, perovskite, Perovskite (structure), chemistry.chemical_classification, Energy conversion efficiency, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Degradation (geology), photoluminescence, 0210 nano-technology
Abstract

International audience; Lead halide perovskites, used to produce photovoltaic devices, have been thesubject of a huge research effort these last years. This is due to the spectac-ular improvement of the conversion effciency results within a short amount oftime. However, some issues have been identified, which include stability, leaduse and cost of some precursors. It has recently been shown that low purity, lowcost PbI2 could be succesfully used in the synthesis of the MAPbI3 perovskite,provided that HCl is added during the synthesis to prevent solubility problems.Thus, it is of high interest to provide information pertaining to the materialquality, in relation with the HCl additions performed during synthesis. In thiswork, we have grown three sets of samples with different HCl to (PbI 2 + MAI)molar ratios (R HCl ), where PbI2 and methylamine iodide (MAI) are the precur-sors of the perovskite. We used RHCl = 0 (no HCl), 0.5 and 1.2 . We performedx-ray diffraction, transmittance and 77K photoluminescence experiments in or-der to assess the material structural and optoelectronic properties and foundthat an optimum HCl concentration must be used. HCl introduction clearlyhas a beneficial effect both on domain sizes and photoluminescence intensityat RHCl = 0.5, but lead to subsequent degradation of the perovskite quality athigher RHCl .

Published
2018

8. From Hamiltonian to zero curvature formulation for classical integrable boundary conditions

Author

Nicolas Crampé, Vincent Caudrelier, Jean Avan, Laboratoire de Physique Théorique et Modélisation (LPTM - UMR 8089), Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Laboratoire de Physique Théorique et Modélisation ( LPTM ), Université de Cergy Pontoise ( UCP ), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb ( L2C ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
High Energy Physics - Theory, Statistics and Probability, Integrable system, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], FOS: Physical sciences, General Physics and Astronomy, Curvature, integrability, 01 natural sciences, chain: Toda, [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th], symbols.namesake, Matrix (mathematics), 0103 physical sciences, transfer matrix, Boundary value problem, 010306 general physics, Mathematical Physics, Mathematical physics, Poisson algebra, curvature: 0, Physics, Hamiltonian formalism, Nonlinear Sciences - Exactly Solvable and Integrable Systems, algebra: Poisson, 010308 nuclear & particles physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Equations of motion, Statistical and Nonlinear Physics, Mathematical Physics (math-ph), 16. Peace & justice, boundary condition, Nonlinear Sciences::Exactly Solvable and Integrable Systems, High Energy Physics - Theory (hep-th), Modeling and Simulation, Lax pair, symbols, pair: Lax, [ PHYS.MPHY ] Physics [physics]/Mathematical Physics [math-ph], Exactly Solvable and Integrable Systems (nlin.SI), Hamiltonian (quantum mechanics)
Abstract

We reconcile the Hamiltonian formalism and the zero curvature representation in the approach to integrable boundary conditions for a classical integrable system in 1+1 space-time dimensions. We start from an ultralocal Poisson algebra involving a Lax matrix and two (dynamical) boundary matrices. Sklyanin's formula for the double-row transfer matrix is used to derive Hamilton's equations of motion for both the Lax matrix {\bf and} the boundary matrices in the form of zero curvature equations. A key ingredient of the method is a boundary version of the Semenov-Tian-Shansky formula for the generating function of the time-part of a Lax pair. The procedure is illustrated on the finite Toda chain for which we derive Lax pairs of size $2\times 2$ for previously known Hamiltonians of type $BC_N$ and $D_N$ corresponding to constant and dynamical boundary matrices respectively., 13 pages. Final version accepted for publication in J. Phys. A as a Letter

Published
2018

9. Overcharging and reentrant condensation of thermoresponsive ionic microgels

Author

Chiara Bazzoni, Simona Sennato, Domenico Truzzolillo, Stefano Sarti, Federico Bordi, Stefano Casciardi, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Sapienza Physics, Department of Physics [Roma La Sapienza], Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], and Istituto Nazionale per l’Assicurazione contro gli Infortuni sul Lavoro [Italian Workers Compensation Authority] (INAIL)

Subjects
Phase transition, Materials science, Chemistry (all), Condensed Matter Physics, FOS: Physical sciences, Ionic bonding, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, 01 natural sciences, Adsorption, Desorption, ComputingMilieux_MISCELLANEOUS, Condensation, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Dielectric spectroscopy, Chemistry, Electrophoresis, Ionic strength, Chemical physics, Soft Condensed Matter (cond-mat.soft), [ PHYS.COND.CM-SCM ] Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

We investigated the complexation of thermoresponsive anionic poly(N-isopropylacrylamide) (PNiPAM) microgels and cationic $\epsilon$-polylysine ($\epsilon$-PLL) chains. By combining electrophoresis, light scattering, transmission electron microscopy (TEM) and dielectric spectroscopy (DS) we studied the adsorption of $\epsilon$-PLL onto the microgel networks and its effect on the stability of the suspensions. We show that the volume phase transition (VPT) of the microgels triggers a large polyion adsorption. Two interesting phenomena with unique features occur: a temperature-dependent microgel overcharging and a complex reentrant condensation. The latter may occur at fixed polyion concentration, when temperature is raised above the VPT of microgels, or by increasing the number density of polycations at fixed temperature. TEM and DS measurements unambiguously show that short PLL chains adsorb onto microgels and act as electrostatic glue above the VPT. By performing thermal cycles, we further show that polyion-induced clustering is a quasi-reversible process: within the time of our experiments large clusters form above the VPT and partially re-dissolve as the mixtures are cooled down. Finally we give a proof that the observed phenomenology is purely electrostatic in nature: an increase of the ionic strength gives rise to the polyion desorption from the microgel outer shell., Comment: 15 Figures

Published
2018

10. Gelation and Re-entrance in Mixtures of Soft Colloids and Linear Polymers of Equal Size

Author

Daniele Parisi, Domenico Truzzolillo, Ali H. Slim, Phillippe Dieudonné-George, Suresh Narayanan, Jacinta C. Conrad, Vishnu D. Deepak, Mario Gauthier, Dimitris Vlassopoulos, Product Technology, University of Groningen [Groningen], Institute of Electronic Structure and Laser (FORTH-IESL), Foundation for Research and Technology - Hellas (FORTH), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), University of Houston, Argonne National Laboratory [Lemont] (ANL), Department of Chemistry [Waterloo], University of Waterloo [Waterloo], and European Project: H2020-MCSA-ITN-2014,Colldense

Subjects
Inorganic Chemistry, [CHIM.POLY]Chemical Sciences/Polymers, Polymers and Plastics, Organic Chemistry, Materials Chemistry, Soft Condensed Matter (cond-mat.soft), FOS: Physical sciences, Colloids, Condensed Matter - Soft Condensed Matter, Polymer, Rheology, Gels, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

Liquid mixtures composed of colloidal particles and much smaller non-adsorbing linear homopolymers can undergo a gelation transition due to polymer-mediated depletion forces. We now show that the addition of linear polymers to suspensions of soft colloids having the same hydrodynamic size yields a liquid-to-gel-to-re-entrant liquid transition. In particular, the dynamic state diagram of 1,4-polybutadiene star-linear polymer mixtures was determined with the help of linear viscoelastic and small angle X-ray scattering experiments. While keeping the star polymers below their nominal overlap concentration, a gel was formed upon increasing the linear polymer content. Further addition of linear chains yielded a re-entrant liquid. This unexpected behavior was rationalized by the interplay of three possible phenomena: (i) depletion interactions, driven by the size disparity between the stars and the polymer length scale which is the mesh size of this entanglement network; (ii) colloidal deswelling due to the increased osmotic pressure exerted onto the stars; and (iii) a concomitant progressive suppression of depletion efficiency on increasing polymer concentration due to reduced mesh size, hence a smaller range of attraction. Our results unveil an exciting new way to tailor the flow of soft colloids and highlight a largely unexplored path to engineer soft colloidal mixtures., Comment: 27 pages, 5 figures

Published
2023

11. Stability of the In-Plane Room Temperature van der Waals Ferromagnet Chromium Ditelluride and Its Conversion to Chromium-Interleaved CrTe2 Compounds

Author

Anike Purbawati, Suman Sarkar, Sébastien Pairis, Marek Kostka, Abdellali Hadj-Azzem, Didier Dufeu, Priyank Singh, Daniel Bourgault, Manuel Nuñez-Regueiro, Jan Vogel, Julien Renard, Laëtitia Marty, Florentin Fabre, Aurore Finco, Vincent Jacques, Lei Ren, Vivekanand Tiwari, Cedric Robert, Xavier Marie, Nedjma Bendiab, Nicolas Rougemaille, Johann Coraux, Micro et NanoMagnétisme (NEEL - MNM), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Systèmes hybrides de basse dimensionnalité (NEEL - HYBRID), Croissance Cristalline et MicroAnalyse (NEEL - C2MA), Brno University of Technology [Brno] (BUT), Ingénierie Expérimentale (NEEL - ExpE), Thermodynamique et biophysique des petits systèmes (NEEL - TPS), Magnétisme et Supraconductivité (NEEL - MagSup), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Laboratoire de physique et chimie des nano-objets (LPCNO), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Fédération de recherche « Matière et interactions » (FeRMI), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Condensed Matter - Materials Science, Materials Chemistry, Electrochemistry, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Electronic, Optical and Magnetic Materials
Abstract

Van der Waals magnetic materials are building blocks for novel kinds of spintronic devices and playgrounds for exploring collective magnetic phenomena down to the two-dimensional limit. Chromium-tellurium compounds are relevant in this perspective. In particular, the 1$T$ phase of CrTe$_2$ has been argued to have a Curie temperature above 300~K, a rare and desirable property in the class of lamellar materials, making it a candidate for practical applications. However, recent literature reveals a strong variability in the reported properties, including magnetic ones. Using electron microscopy, diffraction and spectroscopy techniques, together with local and macroscopic magnetometry approaches, our work sheds new light on the structural, chemical and magnetic properties of bulk 1$T$-CrTe$_2$ exfoliated in the form of flakes having a thickness ranging from few to several tens of nanometers. We unambiguously establish that 1$T$-CrTe$_2$ flakes are ferromagnetic above room temperature, have an in-plane easy axis of magnetization, low coercivity, and we confirm that their Raman spectroscopy signatures are two modes, $E_{2\text{g}}$ (103.5~cm$^{-1}$) and $A_{1\text{g}}$ (136.5~cm$^{-1}$). We also prove that thermal annealing causes a phase transformation to monoclinic Cr$_5$Te$_8$ and, to a lesser extent, to trigonal Cr$_5$Te$_8$. In sharp contrast with 1$T$-CrTe$_2$, none of these compounds have a Curie temperature above room temperature, and they both have perpendicular magnetic anisotropy. Our findings reconcile the apparently conflicting reports in the literature and open opportunities for phase-engineered magnetic properties.

Published
2023

12. Terahertz cyclotron emission from two-dimensional Dirac fermions

Author

S. Gebert, C. Consejo, S. S. Krishtopenko, S. Ruffenach, M. Szola, J. Torres, C. Bray, B. Jouault, M. Orlita, X. Baudry, P. Ballet, S. V. Morozov, V. I. Gavrilenko, N. N. Mikhailov, S. A. Dvoretskii, F. Teppe, Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Institut d’Electronique et des Systèmes (IES), Modélisation et Spectroscopie THz (MOST), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Matériaux (MAT), Capteurs et Instrumentations (CI), Photonique et Ondes (PO), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Colector ANR-19-CE30-0032, Stem2D ANR-19-CE24-0015, and DeMeGras ANR-19-GRF1-0006

Subjects
[PHYS]Physics [physics], Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Abstract

Since the emergence of graphene, we have seen several proposals for the realization of Landau lasers tunable over the terahertz frequency range. The hope was that the non-equidistance of the Landau levels from Dirac fermions would suppress the harmful non-radiative Auger recombination. Unfortunately, even with this non-equidistance an unfavorable non-radiative process persists in Landau-quantized graphene, and so far no cyclotron emission from Dirac fermions has been reported. One way to eliminate this last non-radiative process is to sufficiently modify the dispersion of the Landau levels by opening a small gap in the linear band structure. A proven example of such gapped graphene-like materials are HgTe quantum wells close to the topological phase transition. In this work, we experimentally demonstrate Landau emission from Dirac fermions in such HgTe quantum wells, where the emission is tunable by both the magnetic field and the carrier concentration. Consequently, these results represent an advance in the realization of terahertz Landau lasers tunable by magnetic field and gate-voltage., Main text with the figures of the published version

Published
2023

13. Electrical monitoring of organic crystal phase transition using MoS2 field effect transistor

Author

Ilan Boulet, Simon Pascal, Frederic Bedu, Igor Ozerov, Alain Ranguis, Thomas Leoni, Conrad Becker, Laurence Masson, Aleksandar Matkovic, Christian Teichert, Olivier Siri, Claudio Attaccalite, Jean-Roch Huntzinger, Matthieu Paillet, Ahmed Zahab, Romain Parret, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Montanuniversität Leoben (MUL), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), and ANR-20-CE24-0006,SO_HYPE,Systèmes optiques hybrides pilotés électriquement(2020)

Subjects
crystal phase transition, electronic, General Engineering, FET, Bioengineering, heterostructure, doping, General Chemistry, 2D materials, Atomic and Molecular Physics, and Optics, hybrid heterostructure, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], General Materials Science, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, MoS2
Abstract

International audience; Hybrid van der Waals heterostructures made of 2D materials and organic molecules exploit the high sensitivity of 2D materials to all interfacial modifications and the inherent versatility of the organic compounds. In this study, we are interested in the quinoidal zwitterion/MoS 2 hybrid system in which organic crystals are grown by epitaxy on the MoS 2 surface and reorganize in another polymorph after thermal annealing. By means of field-effect transistor measurements recorded in situ all along the process, atomic force microscopy and density functional theory calculations we demonstrate that the charge transfer between quinoidal zwitterions and MoS 2 strongly depends on the conformation of the molecular film. Remarkably, both the field effect mobility and the current modulation depth of the transistors remain unchanged which opens up promising prospects for efficient devices based on this hybrid system. We also show that MoS 2 transistors enable fast and accurate detection of structural modifications that occur during phases transitions of the organic layer. This work highlights that MoS 2 transistors are remarkable tools for on-chip detection of molecular events occurring at the nanoscale, which paves the way for the investigation of other dynamical systems.

Published
2023

14. High Quality Factor Graphene-Based Two-Dimensional Heterostructure Mechanical Resonator

Author

Marco Will, Markus Müller, Christoph Stampfer, Roman V. Gorbachev, P. Weber, Johannes Güttinger, Matthew J. Hamer, Adrian Bachtold, Adrien Noury, Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, 2D heterostructures, Niobium, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], chemistry.chemical_element, Bioengineering, Nanotechnology, 02 engineering and technology, 01 natural sciences, law.invention, NEMS, Resonator, law, Electrical resistivity and conductivity, 0103 physical sciences, General Materials Science, 010306 general physics, cavity readout, Nanoelectromechanical systems, Resistive touchscreen, business.industry, Graphene, NbSe2, Mechanical Engineering, graphene, Heterojunction, General Chemistry, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Dissipation, 021001 nanoscience & nanotechnology, Condensed Matter Physics, chemistry, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Mechanical resonator, Optoelectronics, 0210 nano-technology, business
Abstract

Ultralight mechanical resonators based on low dimensional materials are well suited as exceptional transducers of minuscule forces or mass changes. However, the low dimensionality also provides a challenge to minimize resistive losses and heating. Here, we report on a novel approach that aims to combine different two-dimensional (2D) materials to tackle this challenge. We fabricated a heterostructure mechanical resonator consisting of few layers of niobium diselenide (NbSe2) encapsulated by two graphene sheets. The hybrid membrane shows high quality factors up to 245,000 at low temperatures, comparable to the best few-layer graphene mechanical resonators. In contrast to few-layer graphene resonators, the device shows reduced electrical losses attributed to the lower resistivity of the NbSe2 layer. The peculiar low-temperature dependence of the intrinsic quality factor points to dissipation over two-level systems which in turn relax over the electronic system. Our high sensitivity readout is enabled by coupling the membrane to a superconducting cavity which allows for the integration of the hybrid mechanical resonator as a sensitive and low loss transducer in future quantum circuits.

Published
2017

15. Integrable Deformations of Sine-Liouville Conformal Field Theory and Duality

Author

Vladimir Fateev, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb ( L2C ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
High Energy Physics - Theory, Primary field, Integrable system, Conformal anomaly, FOS: Physical sciences, integrability, 01 natural sciences, [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th], Bethe ansatz, Conformal symmetry, black hole: duality, 0103 physical sciences, String cosmology, 010306 general physics, Mathematical Physics, Mathematics, S-matrix, Mathematical physics, perturbation theory, field theory: conformal, 010308 nuclear & particles physics, Conformal field theory, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Mathematical analysis, deformation, Ricci flow, High Energy Physics - Theory (hep-th), renormalization group: flow, duality, Geometry and Topology, renormalization group, Analysis
Abstract

International audience; We study integrable deformations of sine-Liouville conformal field theory. Every integrable perturbation of this model is related to the series of quantum integrals of motion (hierarchy). We construct the factorized scattering matrices for different integrable perturbed conformal field theories. The perturbation theory, Bethe ansatz technique, renormalization group and methods of perturbed conformal field theory are applied to show that all integrable deformations of sine-Liouville model possess non-trivial duality properties.

Published
2017

16. Nonperturbative analysis of the spectrum of meson resonances in an ultraviolet-complete composite-Higgs model

Author

Jean-Loïc Kneur, Nicolas Bizot, Marc Knecht, Michele Frigerio, Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique Théorique - UMR CNRS 3681 ( IPHT ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Centre de Physique Théorique - UMR 7332 ( CPT ), Aix Marseille Université ( AMU ) -Université de Toulon ( UTLN ) -Centre National de la Recherche Scientifique ( CNRS ), CPT - E1 Physique des particules, Aix Marseille Université ( AMU ) -Université de Toulon ( UTLN ) -Centre National de la Recherche Scientifique ( CNRS ) -Aix Marseille Université ( AMU ) -Université de Toulon ( UTLN ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Condensed Matter::Quantum Gases, Physics, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, FOS: Physical sciences, Fermion, 01 natural sciences, Pseudoscalar meson, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Goldstone boson, Higgs boson, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, Vector meson, 010306 general physics, Scalar meson, Boson
Abstract

We consider a vector-like gauge theory of fermions that confines at the multi-TeV scale, and that realizes the Higgs particle as a composite Goldstone boson. The weak interactions are embedded in the unbroken subgroup $Sp(4)$ of a spontaneously broken $SU(4)$ flavour group. The meson resonances appear as poles in the two-point correlators of fermion bilinears, and include the Goldstone bosons plus a massive pseudoscalar $\eta'$, as well as scalars, vectors and axial vectors. We compute the mass spectrum of these mesons, as well as their decay constants, in the chiral limit, in the approximation where the hypercolour $Sp(2N)$ dynamics is described by four-fermion operators, \`a la Nambu-Jona Lasinio. By resumming the leading diagrams in the $1/N$ expansion, we find that the spin-one states lie beyond the LHC reach, while spin-zero electroweak-singlet states may be as light as the Goldstone-boson decay constant, $f\sim 1$ TeV. We also confront our results with a set of available spectral sum rules. In order to supply composite top-quark partners, the theory contains additional fermions carrying both hypercolour and ordinary colour, with an associated flavour symmetry-breaking pattern $SU(6)/SO(6)$. We identify and analyse several non-trivial features of the complete two-sector gauge theory: the 't~Hooft anomaly matching conditions; the higher-dimension operator which incorporates the effects of the hypercolour axial-singlet anomaly; the coupled mass-gap equations; the mixing between the singlet mesons of the two sectors, resulting in an extra Goldstone boson $\eta_0$, and novel spectral sum rules. Assuming that the strength of the four-fermion interaction is the same in the two sectors, we find that the coloured vector and scalar mesons have masses $\gtrsim 4 f$, while the masses of coloured pseudo-Goldstone bosons, induced by gluon loops, are $\gtrsim 1.5f$., Comment: v1: 65 pages, 25 figures. v2: 70 pages, 29 figures; several references and clarifications included; two additional subsections on the S-parameter and on the spectral sum rules for mixed mesons

Published
2017

17. Global Jacquet-Langlands correspondence for division algebras in characteristic p

Author

Alexandru Ioan Badulescu, Philippe Roche, Institut Montpelliérain Alexander Grothendieck ( IMAG ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb ( L2C ), Institut Montpelliérain Alexander Grothendieck (IMAG), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Laboratoire Charles Coulomb (L2C)

Subjects
Pure mathematics, Mathematics::Number Theory, General Mathematics, 010102 general mathematics, Automorphic form, Jacquet–Langlands correspondence, Multiplicity (mathematics), 16. Peace & justice, 01 natural sciences, Unitary state, Injective function, [ MATH.MATH-RT ] Mathematics [math]/Representation Theory [math.RT], [ MATH.MATH-NT ] Mathematics [math]/Number Theory [math.NT], Square-integrable function, 0103 physical sciences, Division algebra, 010307 mathematical physics, 0101 mathematics, [MATH]Mathematics [math], Mathematics::Representation Theory, Global field, Mathematics
Abstract

29 pages; We prove a full global Jacquet-Langlands correspondence between GL(n) and division algebras over global fields of non zero characteristic. If $D$ is a central division algebra of dimension $n^2$ over a global field $F$ of non zero characteristic, we prove that there exists an injective map from the set of automorphic square integrable representations of the multiplicative group of $D$ to the set of automorphic square integrable representations of GL_n(F), compatible at all places with the local Jacquet-Langlands correspondence for unitary representations. We characterize the image of the map. As a consequence we get multiplicity one and strong multiplicity one theorems for the multiplicative group of D.

Published
2017

18. Quantification of the Effect of Surface Slope on Mechanical Measurements by Contact-Resonance AFM

Author

Heinze, Karsta, Arnould, Olivier, Delenne, Jean-Yves, Lullien-Pellerin, Valerie, Ramonda, Michel, George, Matthieu, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Bois (BOIS), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centrale de Technologie en Micro et Nanoélectronique CTM-­LMCP, Université de Montpellier (UM), Labex Numev, Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Bois ( BOIS ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Centrale de Technologie en Micro et Nanoélectrique CTM-­LMCP, and Université de Montpellier ( UM )

Subjects
[ SDV ] Life Sciences [q-bio], [SDV]Life Sciences [q-bio]
Published
2017

19. Evolution of methane density during melting in nanopores

Author

Bogdan Kuchta, Ph. Llewellin, Carlos Wexler, Ege Dundar, Lucyna Firlej, Matériaux divisés, interfaces, réactivité, électrochimie ( MADIREL ), Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ), University of Missouri-Columbia, Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Wroclaw University of Technology [Wroclaw], Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC), University of Missouri [Columbia] (Mizzou), University of Missouri System, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Wroclaw University of Science and Technology, and Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Pore size, Materials science, Nanotechnology, 02 engineering and technology, Structural heterogeneity, 01 natural sciences, Catalysis, Methane, law.invention, Inorganic Chemistry, chemistry.chemical_compound, Nanopores, Adsorption, law, Phase (matter), 0103 physical sciences, Physical and Theoretical Chemistry, 010304 chemical physics, Graphene, Organic Chemistry, Melting, 021001 nanoscience & nanotechnology, Computer Science Applications, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Nanopore, Computational Theory and Mathematics, chemistry, Chemical physics, [ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistry, Molecular Density, 0210 nano-technology
Abstract

International audience; Phase properties of gases adsorbed in small nanopores are mainly determined by the pore size and shape as well as the structural heterogeneity of the adsorbate. Here we analyze the evolution of the melting mechanism that occurs in pores

Published
2017

20. Bottom-up model for understanding the effects of wheat endosperm microstructure on its mechanical strength

Author

Farhang Radjai, Jean-Yves Delenne, Valerie Lullien-Pellerin, Emna Chichti, Matthieu George, Rafik Affes, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Multiscale Materials Science for Energy and Environment ( MSE2 ), Massachusetts Institute of Technology ( MIT ) -Centre National de la Recherche Scientifique ( CNRS ), and Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)

Subjects
0106 biological sciences, structure granulaire, Materials science, Starch, Ingénierie des aliments, Failure, [SDV.SA.AGRO]Life Sciences [q-bio]/Agricultural sciences/Agronomy, Granular material, 01 natural sciences, Endosperm, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], chemistry.chemical_compound, 0404 agricultural biotechnology, [ SDV.SA.AGRO ] Life Sciences [q-bio]/Agricultural sciences/Agronomy, Hardness, Ultimate tensile strength, Numerical modeling, Food engineering, Composite material, grain de blé, Porosity, Elastic modulus, Vitreousness, modélisation, 2. Zero hunger, Wheat endospem, Cemented granular material, endosperme, Wheat endosperm, protéine de blé, food and beverages, dureté du grain, 04 agricultural and veterinary sciences, Microstructure, amidon de blé, 040401 food science, résistance mécanique, matrice amidon protéine, chemistry, [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Volume fraction, vitrescence, 010606 plant biology & botany, Food Science
Abstract

International audience; Wheat flours are essential ingredients of daily food products like bread, cookies or pastries. Their quality depends on the milling process and mechanical strength of wheat grains. Although it is well known that the strength and rupture of grains are strongly controlled by the endosperm microstructure, the respective roles of the starch and polymer volume fractions and their adhesion are not yet fully understood. This typical biological microstructure can be modeled as a cemented granular material, where the two size populations of starch granules (large:A-type, small:B-type) are the particles, and the protein matrix, which partially fills the space between granules, plays the role of a cement. This structural model of wheat endosperm is used, together with mechanical characteristics of starch and proteins obtained by means of Atomic Force Microscopy (AFM) measurements, to simulate the mechanical behavior and breakage of wheat endosperm in milling process. We find that the porosity outweighs the effect of other parameters for the elastic modulus, which declines as a nearly linear function of porosity. We also show that the tensile strength is an increasing function of the amount and connectivity of starch granules with increasing concentration of stresses along chains of granules. This effect is more significant at low porosity where stress distribution is mainly controlled by the contact network between starch granules. This effect explains why the protein content is not fully correlated to vitreousness, and samples of similar protein content can be different in vitreosity. Finally, we find that the starch-granule adhesion strongly affects the tensile strength whereas the effect of starch volume fraction appears mainly at high interface adhesion, which is the case of hard type wheat grains.

Published
2016

21. Cleavage and size reduction of graphite crystal using ultrasound radiation

Author

Laurent Duclaux, Stanisław Duber, Szymon Łoś, Łukasz Hawełek, Wojciech Kempiński, Laurent Alvarez, Laboratoire de Chimie Moléculaire et Environnement ( LCME ), Université Grenoble Alpes [Saint Martin d'Hères]-Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Sonication, Intercalation (chemistry), Mineralogy, 02 engineering and technology, 010402 general chemistry, [ CHIM ] Chemical Sciences, 01 natural sciences, law.invention, [ SDE ] Environmental Sciences, Crystal, symbols.namesake, law, General Materials Science, Graphite, ComputingMilieux_MISCELLANEOUS, Aqueous solution, Graphene, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Chemical engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, [ CHIM.ANAL ] Chemical Sciences/Analytical chemistry, Particle size, 0210 nano-technology, Raman spectroscopy
Abstract

International audience; The influence of ultrasound radiation on graphite structure was studied by laser light scattering, X-ray diffraction, Raman spectroscopy and Transmission Electron Microscopy. Irradiations of polycrystalline graphite powder suspensions at frequencies of 20 kHz and 500 kHz, were carried out in three different solvents: water (as the best medium for cavitation), a surfactant (OMImBr) aqueous solution and also a mixture of sulfuric and nitric acids which caused the exfoliation by intercalation. The average basal particle size of 168 lm was reduced to 4 lm after ultrasonication delivering a huge energy density up to 1.2 MW/m2. Change of the sonication time and the nature of the solvents produced different reduction of the graphite crystals dimensions, affecting the out of plane thickness and the basal width as well. The ultrasonication promoted the disordering of the graphite tridimensional stacking for all solvents used, with the strongest effect in acidic medium. Turbostratic structures formation and exfoliation of graphene flakes have been observed after the use of surfactant for sonication medium. Intercalation in acid medium prior to the ultrasound treatment produced similar effects.

Published
2013

22. Strongly Emitting Folic Acid-Derived Carbon Nanodots for One- and Two-Photon Imaging of Lyotropic Myelin Figures

Author

Benkowska-Biernacka, Dominika, Mucha, Sebastian, Firlej, Lucyna, Formalik, Filip, Bantignies, Jean-Louis, Anglaret, Eric, Samoć, Marek, Matczyszyn, Katarzyna, Institute of Advanced Materials, Wroclaw University of Science and Technology, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Astronomy [Columbia] (Mizzou Physics), University of Missouri [Columbia] (Mizzou), University of Missouri System-University of Missouri System, Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Department of Chemical and Biological Engineering, Northwestern University, and Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], [CHIM.ORGA]Chemical Sciences/Organic chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Published
2023

23. STM-based electrical generation of surface plasmons enhanced by nanoantenna (Orale)

Author

J-P. Hugonin, C. Sauvan, François Marquier, F. Bigourdan, J.-J. Greffet, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry / Naphel, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Fabry ( LCF ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut d'Optique Graduate School ( IOGS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Paris-Sud - Paris 11 ( UP11 ) -Institut d'Optique Graduate School ( IOGS ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, [ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Surface plasmon, Physics::Optics, 01 natural sciences, law.invention, 010309 optics, Optics, Surface wave, law, 0103 physical sciences, Polariton, Miniaturization, Optoelectronics, Scanning tunneling microscope, Photonics, 010306 general physics, business, Plasmon, Quantum tunnelling, ComputingMilieux_MISCELLANEOUS
Abstract

Surface plasmons polaritons (SPP) are charge-density surface waves, confined at the interface between a metal and an insulator. This confinement property makes SPPs good candidates for optoelectronic devices miniaturization. Recently, several groups have used a scanning tunneling microscope (STM) tip [1], [2] to generate surface plasmons via inelastic tunneling. This elegant technique suggests the possibility to integrate an electrical SPP source directly into the SPP circuit. Yet, the efficiency is very low and the radiation spectrum is very large. We introduce a resonant plasmonic nanoantenna to circumvent these issues. Our study predicts an enhancement by more than two orders of magnitude of the electrical power conversion to SPP as well as a tunable narrow emission spectrum. Our analysis allows one to understand recent experiments from other groups demonstrating such an enhancement [3], [4], [5]. Some of those results were recently published in [6].

Published
2016

24. Non-equilibrium Casimir interactions : from dynamical to thermal effects

Author

Noto, Antonio, Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Université Montpellier, Mauro Antezza, Roberto Passante, Brahim Guizal, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Università degli studi (Palerme, Italie)

Subjects
[PHYS.PHYS]Physics [physics]/Physics [physics], Dynamical Casimir effect, Casimir-Lifshitz forces, Forces de Casimir-Lifshitz, Effet Casimir, [ PHYS.PHYS ] Physics [physics]/Physics [physics], Out of equilibrium, Accelerated atoms, Effet Casimir dynamique, Casimir effect, Force de Casimir-Polder, Casimir-Polder forces, Hors d'équilibre, Atomes accélérés
Abstract

In this thesis, after an introduction where we briefly present the general context of Casimir physics, we present the results obtained during the PhD. At first, we show our work about the van der Waals/Casimir-Polder interactions between two atoms in an out-of-equilibrium condition due to their uniformly accelerated motion. We study the system of two uniformly accelerated atoms in vacuum space, when they are in their ground-state and when they are in a correlated state (one excited and one ground-state atom). We analyze this system both with an heuristic semiclassical model and with a more rigorous method, based on a separation of radiation reaction and vacuum fluctuations contributions, that we extend starting from a general procedure known in literature. We find a change of the distance-dependence of the interaction due to the acceleration. We show that Casimir-Polder forces between two relativistic uniformly accelerated atoms, interacting with the scalar field, exhibit a transition from the short-distance thermal-like behavior predicted by the Unruh effect to a long-distance nonthermal behavior, associated with the breakdown of a local inertial description of the system. In addition, we obtain new features of the resonance interaction in the case of atoms interacting with the quantum electromagnetic field.Next, we present our work about a new optomechanical coupling of an effectively oscillating mirror with a Rydberg atoms gas, mediated by the dynamical atom-mirror Casimir-Polder force. We find that this coupling may produce a near-field resonant atomic excitation not related to the excitation of atoms by the few real photons expected by dynamical Casimir effect. In accessible experimental conditions, this excitation probability is significant (about 20%) making the observation of this new dynamical Casimir-Polder effect possible. For this reason, we propose a realistic experimental configuration to realize this system made of a cold atom gas trapped in front of a semiconductor substrate, whose dielectric properties are periodically modulated in time.Finally, we focus on our results obtained for the Casimir-Lifshitz pressure between two different dielectric lamellar gratings. This system is assumed to be in an out-of-thermal-equilibrium configuration, i.e. the two gratings have two different temperatures and they are immersed in a thermal bath having a third temperature. The computation of the pressure is based on a method exploiting the scattering operators of the bodies, deduced using the Fourier modal method. In our numerical results we characterize in detail the behavior of the pressure, both by varying the three temperatures and by changing the geometrical parameters of the gratings. In this way we show that it is possible to tune the force from attractive to repulsive or to strongly reduce the pressure for large ranges of temperatures. Moreover, we stress that the interplay between nonequilibrium effects and geometrical periodicity make this system particularly interesting for the observation of the repulsive Casimir force.; Dans cette thèse, après une introduction où nous présentons brièvement la physique des forces de Casimir, nous montrons nos résultats obtenus pendant le doctorat. D'abord, nous montrons notre travail sur les interactions de van der Waals / Casimir-Polder lorsque le système est dans une configuration hors équilibre à cause du mouvement uniformément accéléré des atomes. Nous étudions le système de deux atomes uniformément accélérés dans le vide quantique quand ils sont dans leur état fondamental ou dans un état corrélé (un atome excité et un atome dans son état fondamental). Nous analysons ce système avec un modèle heuristique semi-classique et une méthode plus rigoureuse qui nous avons étendu à partir d'une procédure générale développée dans la littérature. Nous trouvons un changement de la dépendance de l'interaction de la distance en raison de l'accélération. Nous montrons que les forces de Casimir-Polder entre deux atomes uniformément accélérés en mouvement relativiste, qui interagissent avec le champ scalaire, présentent une transition à partir d'un comportement thermique à courtes distances, comme prédit par l'effet Unruh, à un comportement non thermique à longues distances, associé à la rupture de la description inertielle et locale du système. En plus, lorsque le cas d'atomes qui interagissent avec le champ électromagnétique quantique est considéré, on constate que de nouvelles caractéristiques apparaissent dans l'interaction.Ensuite, nous présentons notre travail sur un nouveau couplage opto-mécanique d'un miroir oscillant de façon efficace avec un gaz d'atomes de Rydberg, médié par la force atome-miroir dynamique de Casimir-Polder. Nous constatons que ce couplage peut produire une excitation de résonance atomique de champ proche, qui n'est pas liée à l'excitation des atomes par les quelques photons réels attendus de l'effet Casimir dynamique. Dans des conditions expérimentales accessibles, cette probabilité d'excitation est importante (environ 20 %) et rend possible l'observation de ce nouvel effet Casimir-Polder dynamique. Donc nous proposons une configuration expérimentale réaliste pour réaliser ce système fait d'un gaz d'atomes froids piégés mis en face d'un substrat semi-conducteur, dont les propriétés diélectriques sont modulées dans le temps.Enfin, nous nous concentrons sur nos résultats obtenus pour le calcul de la pression Casimir-Lifshitz entre deux réseaux lamellaires diélectriques différents. Ce système est supposé dans une configuration hors équilibre thermique. En fait, les deux réseaux présentent deux températures différentes et ils sont immergés dans un bain thermique ayant une troisième température. Le calcul de la pression est basé sur une méthode qui exploite les opérateurs de diffusion des réseaux, déduits en utilisant la méthode modale de Fourier. Nous présentons nos résultats numériques caractérisant en détail le comportement de la pression, en faisant varier les trois températures et en modifiant les paramètres géométriques des réseaux. Cette variation des paramètres du système permet de régler la force de répulsive à attractive ou de réduire fortement la pression pour des intervalles de températures. En outre, on montre que la combinaison des effets de non-équilibre et géométriques rend ce système particulièrement intéressant pour l'observation de la force de Casimir répulsive.

Published
2016

25. Simulation and Characterization of Tetracosane on Graphite: Molecular Dynamics Beyond the Monolayer

Author

Carlos Wexler, M.W. Roth, E. Maldonado, M. J. Connolly, Lucyna Firlej, Bogdan Kuchta, Centre IRMf de Marseille, Université de la Méditerranée - Aix-Marseille 2, Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Matériaux divisés, interfaces, réactivité, électrochimie ( MADIREL ), Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ), Department of Physics, University of Northern Iowa, Cedar Falls, Department of Physics and Astronomy [Columbia], University of Missouri-Columbia, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Department of Physics [Cedar Falls], University of Northern Iowa (UNI), Department of Physics and Astronomy [Columbia] (Mizzou Physics), University of Missouri [Columbia] (Mizzou), University of Missouri System-University of Missouri System, and Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, Nanotechnology, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 01 natural sciences, CARBON NANOTUBES, law.invention, Molecular dynamics, chemistry.chemical_compound, law, Monolayer, Perpendicular, Tetracosane, Graphite, Physical and Theoretical Chemistry, Bilayer, Intermolecular force, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, General Energy, chemistry, Chemical physics, [ CHIM.MATE ] Chemical Sciences/Material chemistry, 0210 nano-technology
Abstract

International audience; We present the results of extensive fully atomistic molecular dynamics (MD) simulations of tetracosane (C24H50) bilayer and trilayer systems adsorbed onto the basal plane of graphite. At low temperature, both layers of the bilayer exist in well-defined solid phases. With increasing temperature, the system exhibits separated smectic phases that eventually lead to melting. During this process, we observed a strong interlayer translational correlation and mobility between layers; however, the upper layer presents more intra- (chain) and intermolecular disorder because of a lack of confinement and a greater distance to the graphite substrate. Simulations of the perpendicular trilayer patch show that gauche defects provide the main mechanism for spreading of the bottom and outer perimeter of the patch in the solid, leading to the ultimate collapse of the patch with increasing temperature and formation of a flat (parallel) trilayer that melts at a higher temperature than the bilayer structure. The wide variety of structural order parameters, thermodynamic functions, and probability distributions we employed provide a clear picture of the roles of gauche defects, confinement, and interlayer correlation in the phases and phase transitions exhibited by these confined organic layers.

Published
2016

26. Low temperature mechanism of adsorption of methane: Comparison between homogenous and heterogeneous pores

Author

Bogdan Kuchta, Lucyna Firlej, Carlos Wexler, Ege Dundar, Pascal Boulet, Philip L. Llewellyn, Justyna Rogacka, Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Wroclaw University of Science and Technology, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Astronomy [Columbia] (Mizzou Physics), University of Missouri [Columbia] (Mizzou), University of Missouri System-University of Missouri System, Aix Marseille Université (AMU), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC), Matériaux divisés, interfaces, réactivité, électrochimie ( MADIREL ), Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Department of Physics and Astronomy [Columbia], University of Missouri-Columbia, and Aix Marseille Université ( AMU )

Subjects
Chemical substance, Inorganic chemistry, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Methane, chemistry.chemical_compound, Colloid and Surface Chemistry, Adsorption, Molecule, Intermolecular force, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, chemistry, Chemical engineering, 13. Climate action, [ CHIM.MATE ] Chemical Sciences/Material chemistry, [ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Layering, 0210 nano-technology, Science, technology and society, Carbon
Abstract

International audience; ! abstract The mechanisms of methane adsorption in (i) homogeneous carbon slit pores of widths between 1 nm and 2 nm and (ii) heterogeneous MOF pores of similar unit cell sizes have been compared. We discuss the mechanism of layering transition in subcritical conditions, for temperatures between 80 K and 180 K. The layer formation is strongly temperature-dependent. In slit pores it varies from a sharp adsorption at low temperatures to a more continuous uptake at higher temperatures. The pore size defines the number of adsorbed layers: the 1 nm pore allows adsorption of 2 layers while the 2 nm pore allows adsorption of 5 layers of methane molecules. We compare this behavior with the mechanism of adsorption in two MOFs, IRMOF-1 and IRMOF-16, with strongly heterogeneous walls (both structurally and energetically). This comparison allows us to discuss separately the influence of wall topology and intermolecular interactions on the mechanism of layering.

Published
2016

27. Integrated Process for Structuring and Functionalizing Ordered Mesoporous Silica to Achieve Superprotonic Conductivity

Author

Jason Richard, Anthony Phimphachanh, Julien Schneider, Shyamapada Nandi, Eline Laurent, Patrick Lacroix-Desmazes, Philippe Trens, Sabine Devautour-Vinot, Nathalie Marcotte, Corine Gérardin, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Université de Montpellier (UM), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), and Gerardin, Corine

Subjects
[CHIM.INOR] Chemical Sciences/Inorganic chemistry, [CHIM.MATE] Chemical Sciences/Material chemistry, General Chemical Engineering, Materials Chemistry, mesoporous materials, proton conduction, strong acid, water sorption, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, [CHIM.INOR]Chemical Sciences/Inorganic chemistry
Abstract

International audience; Polyacid-functionalized inorganic mesoporous materials have attracted considerable interest as catalysts, permselective molecular sieves or drug carriers. Despite their great interest, their synthesis into ordered mesostructures incorporating polyacids densely and homogeneously distributed in the mesopores, is a challenge. Moreover, their properties as conductors for energy applications remain completely unexplored. Here we report an efficient, one-shot environmentally friendly synthesis route to prepare ordered mesoporous silica functionalized with strong polyacids, which exhibits excellent proton conductivity. We used polyion electrostatic complex micelles as structure-directing, functionalizing and pore-generating agents to obtain a material of remarkable textural and functional quality. It presents large and ordered mesopores hosting monodisperse polyacid chains corresponding to a dense and homogeneous functionalization of 1.2 mmolSO 3 H.gSiO 2-1 and a function density of 1 SO3H per nm 3 of mesopore volume. Overcoming the performance-limiting inhomogeneities, we designed a superprotonic conductor, while the high value of the conductivity, 0.024 S cm-1 at 363 K/95% relative humidity, was maintained at least 7 days.

Published
2022

28. Metal-insulator crossover in monolayer MoS2

Author

Ivanovitch Castillo, Thibault Sohier, Matthieu Paillet, Dilek Cakiroglu, Christophe Consejo, Chengyu Wen, Felipe Wasem Klein, Meng-Qiang Zhao, Abdelkarim Ouerghi, Sylvie Contreras, A T Charlie Johnson, Matthieu Jean Verstraete, Benoit jean-pierre Jouault, Sebastien Nanot, Université de Montpellier, University of Liege, Department of Neuroscience and Biomedical Engineering, University of Pennsylvania, New Jersey Institute of Technology, Université Paris-Saclay, Aalto-yliopisto, Aalto University, Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Q MAT CESAM, Univ Liege, Theoret Mat Phys, Liège, University of Pensylvania, New Jersey Institute of Technology [Newark] (NJIT), Department of Physics and Astronomy, University of Pennsylvania, Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), ANR-18-CE24-0004,JJEDi,Jonctions Josephson contrôlées Electrostatiquement dans les Dichalcogénures(2018), European Project: 2020225411,Optospin, and European Project: G.A. 21/25-11,DREAMS

Subjects
metal insulator transition, electronic transport, Mechanics of Materials, Mechanical Engineering, transition metal dichalcogenides, General Materials Science, Bioengineering, General Chemistry, Electrical and Electronic Engineering, MoS2, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
Abstract

We report on transport measurements in monolayer MoS2 devices, close to the bottom of the conduction band edge. These devices were annealed in situ before electrical measurements. This allows us to obtain good ohmic contacts at low temperatures, and to measure precisely the conductivity and mobility via four-probe measurements. The measured effective mobility up to μeff = 180 cm2/Vs is among the largest obtained in CVD-grown MoS2 monolayer devices. These measurements show that electronic transport is of the insulating type for σ≤ 1.4e2/h and n ≤ 1.7×1012 cm-2, and a crossover to a metallic regime is observed above those values. In the insulating regime, thermally activated transport dominates at high temperature (T > 100 K). At lower temperatures, conductivity is driven by Efros-Schklovkii variable range hopping in all measured devices, with a universal and constant hopping prefactor, that is a clear indication that hopping is not phonon-mediated. At higher carrier density, and high temperature, the conductivity is well modeled by the Boltzmann equation for a non-interacting Fermi gas, taking into account both phonon and impurity scatterings. Finally, even if this apparent metal-insulator transition can be explained by phonon-related phenomena at high temperature, the possibility of a genuine 2D MIT cannot be ruled out, as we can observe a clear power-law diverging localization length close to the transition, and a one-parameter scaling can be realized.

Published
2023

29. Tadpoles and Gauge Symmetries

Author

Braun, Andreas P., Fraiman, Bernardo, Graña, Mariana, Lüst, Severin, Parra de Freitas, Héctor, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics - Theory, F-theory, moduli: stability, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], hep-th, tadpole, symmetry: gauge, algebra: gauge, FOS: Physical sciences, algebra: Lie, High Energy Physics - Theory (hep-th), moduli space, surface, gauge: nonabelian, Particle Physics - Theory, compactification: flux
Abstract

The tadpole conjecture proposes that complex structure moduli stabilisation by fluxes that have low tadpole charge can be realised only at special points in moduli space, leading generically to (large) gauge symmetries. Here we provide an exhaustive survey of the gauge symmetries arising in F-theory flux compactifications on products of attractive $\mbox{K3}$ surfaces, with complex structure moduli fully stabilised. We compute the minimal rank of the left-over non-abelian gauge group for all flux configurations within the tadpole bound, finding that it is always non-zero. It decreases in a roughly linear fashion with the tadpole charge, reaching zero at charge 30. By working out possible gauge algebras for different values of the tadpole, we find that all simple ADE Lie algebras of rank $\le 18$ appear., 40 pages

Published
2023

30. High numerical aperture holographic microscopy reconstruction with extended z range

Author

Gilles Tessier, Michel Gross, Dario Donnarumma, Nicolas Verrier, Laboratoire Hubert Curien / Eris, Laboratoire Hubert Curien [Saint Etienne] (LHC), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Holographic Microscopy Group, Neurophotonics Laboratory, Laboratoire de Neurophotonique (UMR 8250), Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5)-Centre National de la Recherche Scientifique (CNRS), Institut Langevin ondes et images, Centre National de la Recherche Scientifique (CNRS)-ESPCI ParisTech-Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC), Agence Nationale de la Recherche : ANR Blanc Simi 10 (n 11 BS10 01502), Agence Nationale de la Recherche : Labex Numev (convention ANR-10-LABX-20), ANR-10-LABX-0020/10-LABX-0020,NUMEV,Digital and Hardware Solutions and Modeling for the Environement and Life Sciences(2010), Laboratoire Hubert Curien [Saint Etienne] ( LHC ), Institut d'Optique Graduate School ( IOGS ) -Université Jean Monnet [Saint-Étienne] ( UJM ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut d'Optique Graduate School ( IOGS ) -Université Jean Monnet [Saint-Étienne] ( UJM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Neurophotonique ( UMR 8250 ), Université Paris Descartes - Paris 5 ( UPD5 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Paris Descartes - Paris 5 ( UPD5 ) -Centre National de la Recherche Scientifique ( CNRS ), Centre National de la Recherche Scientifique ( CNRS ) -ESPCI ParisTech-Université Paris Diderot - Paris 7 ( UPD7 ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ), ANR-10-LABX-0020/10-LABX-0020,NUMEV,Digital and Hardware Solutions and Modeling for the Environement and Life Sciences ( 2010 ), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Langevin - Ondes et Images (UMR7587) (IL), Sorbonne Université (SU)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Paris (UP)-Centre National de la Recherche Scientifique (CNRS), and ANR-10-LABX-0020,NUMEV,Digital and Hardware Solutions and Modeling for the Environement and Life Sciences(2010)

Subjects
Physics, Afocal photography, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], [ PHYS.PHYS.PHYS-OPTICS ] Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Materials Science (miscellaneous), Holography, FOS: Physical sciences, Grating, Half-space, Curvature, Industrial and Manufacturing Engineering, law.invention, Angular spectrum method, Optics, (090.1995) Digital holography, (100.3010) Image reconstruction techniques, (110.0180) Microscopy, Kernel (image processing), law, Microscopy, Business and International Management, business, Optics (physics.optics), Physics - Optics
Abstract

International audience; An holographic microscopy reconstruction method compatible with high numerical aperture microscope objective (MO) up to NA=1.4 is proposed. After off axis and reference field curvature corrections, and after selection of the +1 grating order holographic image, a phase mask that transforms the optical elements of the holographic setup into an afocal device is applied in the camera plane. The reconstruction is then made by the angular spectrum method. The field is first propagated in the image half space from the camera to the afocal image of the MO optimal plane (plane for which MO has been designed) by using a quadratic kernel. The field is then propagated from the MO optimal plane to the object with the exact kernel. Calibration of the reconstruction is made by imaging a calibrated object like an USAF resolution target for different positions along z. Once the calibration is done, the reconstruction can be made with an object located in any plane z. The reconstruction method has been validated experimentally with an USAF target imaged with a NA=1.4 microscope objective. Near-optimal resolution is obtained over an extended range (±50 µm) of z locations.

Published
2015

31. Scale-Invariant Resummed Perturbation at Finite Temperatures

Author

Jean-Loïc Kneur, Marcus Benghi Pinto, Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Departamento Física [Florianópolis], Universidade Federal de Santa Catarina [Florianópolis] ( UFSC ), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Universidade Federal de Santa Catarina = Federal University of Santa Catarina [Florianópolis] (UFSC)

Subjects
Quantum chromodynamics, Physics, Phase transition, 010308 nuclear & particles physics, Critical phenomena, General Physics and Astronomy, Perturbation (astronomy), FOS: Physical sciences, Scale invariance, Renormalization group, 01 natural sciences, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Quantum electrodynamics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Thermal, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 010306 general physics, Quartic interaction, Mathematical physics
Abstract

We use the scalar model with quartic interaction to illustrate how a nonperturbative variational technique combined with renormalization group (RG) properties efficiently resums perturbative expansions in thermal field theories. The resulting convergence and scale dependence of optimized thermodynamical quantities, here illustrated up to two-loop order, are drastically improved as compared to standard perturbative expansions, as well as to other related methods such as the screened perturbation or (resummed) hard-thermal-loop perturbation, that miss RG invariance as we explain. Being very general and easy to implement, our method is a potential analytical alternative to deal with the phase transitions of field theories such as thermal QCD., 5 pages, 1 figure. v2: additional explanations on the generically improved scale invariance at higher orders, typos corrected, figure quality improved, to appear in Phys.Rev.Lett

Published
2015

32. Ionic transport through sub-10 nm diameter hydrophobic high-aspect ratio nanopores: experiment, theory and simulation

Author

Balme, Sébastien, Picaud, Fabien, MANGHI, Manoel, Palmeri, John, Bechelany, Mikhael, Cabello-Aguilar, Simon, Abou Chaaya, Adib, Miele, Philippe, Balanzat, Emmanuel, Janot, Jean-Marc, Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Nanomédecine, imagerie, thérapeutique - UFC (EA 4662) (NIT / NANOMEDECINE), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Physique Statistique des Systèmes Complexes (LPT) (PhyStat), Laboratoire de Physique Théorique (LPT), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), ANR-12-BS08-0023 - TRANSION, ANR-12-BS08-0023,TRANSION,TRANSport IONique au sein de canaux-ioniques biologiques confinés dans des nanopores: approche expérimentale et théorique(2012), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Nanomédecine, imagerie, thérapeutique - UFC (UR 4662) (NIT / NANOMEDECINE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut Européen des membranes ( IEM ), Centre National de la Recherche Scientifique ( CNRS ) -Ecole Nationale Supérieure de Chimie de Montpellier ( ENSCM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Université de Montpellier ( UM ), Nanomédecine, imagerie, thérapeutique - UFC ( NIT / NANOMEDECINE ), Université Bourgogne Franche-Comté ( UBFC ) -Université de Franche-Comté ( UFC ), Physique Statistique des Systèmes Complexes (LPT), Laboratoire de Physique Théorique - IRSAMC ( LPT ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de recherche sur les Ions, les MAtériaux et la Photonique ( CIMAP - UMR 6252 ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ), ANR-12-BS08-0023,TRANSION,TRANSport IONique au sein de canaux-ioniques biologiques confinés dans des nanopores: approche expérimentale et théorique ( 2012 ), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Chemical Physics (physics.chem-ph), [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Condensed Matter - Mesoscale and Nanoscale Physics, [PHYS.PHYS.PHYS-BIO-PH]Physics [physics]/Physics [physics]/Biological Physics [physics.bio-ph], FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [ PHYS.COND.CM-SM ] Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], [ PHYS.PHYS.PHYS-BIO-PH ] Physics [physics]/Physics [physics]/Biological Physics [physics.bio-ph], Nanoscience and technology, Physics - Chemical Physics, [ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistry, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Soft Condensed Matter (cond-mat.soft), [ PHYS.PHYS.PHYS-FLU-DYN ] Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech]
Abstract

Fundamental understanding of ionic transport at the nanoscale is essential for developing biosensors based on nanopore technology and new generation high-performance nanofiltration membranes for separation and purification applications. We study here ionic transport through single putatively neutral hydrophobic nanopores with high aspect ratio (of length L=6 \mu m with diameters ranging from 1 to 10 nm) and with a well controlled cylindrical geometry. We develop a detailed hybrid mesoscopic theoretical approach for the electrolyte conductivity inside nanopores, which considers explicitly ion advection by electro-osmotic flow and possible flow slip at the pore surface. By fitting the experimental conductance data we show that for nanopore diameters greater than 4 nm a constant weak surface charge density of about 10$^{-2}$ C m$^{-2}$ needs to be incorporated in the model to account for conductance plateaus of a few pico-Siemens at low salt concentrations. For tighter nanopores, our analysis leads to a higher surface charge density, which can be attributed to a modification of ion solvation structure close to the pore surface, as observed in the molecular dynamics simulations we performed., Comment: 14 pages, Supplementary information available on request

Published
2015

33. Crossed cerebellar diaschisis after awake brain surgery: Can we measure pre/post operative changes on resting state fMRI data?

Author

N. Menjot de Champfleur, H. Duffau, E. Le Bars, Anthony Boyer, Jeremy Deverdun, François Bonnetblanc, Artificial movement and gait restoration (DEMAR), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Cognition, Action, et Plasticité Sensorimotrice [Dijon - U1093] (CAPS), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut d’Imagerie Fonctionnelle Humaine [CHU Montpellier] (I2FH), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut des Neurosciences de Montpellier (INM), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Neurochirurgie [Hôpital Gui de Chauliac], Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier)-Hôpital Gui de Chauliac [CHU Montpellier], Artificial movement and gait restoration ( DEMAR ), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier ( LIRMM ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Inria Sophia Antipolis - Méditerranée ( CRISAM ), Institut National de Recherche en Informatique et en Automatique ( Inria ) -Institut National de Recherche en Informatique et en Automatique ( Inria ), Cognition, Action, et Plasticité Sensorimotrice [Dijon - U1093] ( CAPS ), Université de Bourgogne ( UB ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Institut d’Imagerie Fonctionnelle Humaine ( I2FH ), Centre Hospitalier Régional Universitaire [Montpellier] ( CHRU Montpellier ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Institut des Neurosciences de Montpellier - Déficits sensoriels et moteurs ( INM ), Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Université de Montpellier ( UM ), Centre Hospitalier Régional Universitaire [Montpellier] ( CHRU Montpellier ) -Hôpital Gui de Chauliac, Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Institut des Neurosciences de Montpellier - Déficits sensoriels et moteurs (INM), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier)-Hôpital Gui de Chauliac [Montpellier], and Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Inria Sophia Antipolis - Méditerranée (CRISAM)

Subjects
tumor, positron-emission-tomography, 030218 nuclear medicine & medical imaging, ischemic-stroke, 03 medical and health sciences, 0302 clinical medicine, Glioma, blood-flow, medicine, Post operative, Awake surgery, Cerebellum hemisphere, Resting state fMRI, medicine.diagnostic_test, fungi, food and beverages, medicine.disease, Crossed cerebellar diaschisis, nervous system, Positron emission tomography, [ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], plasticity, connectivity, networks, Ischemic stroke, [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], history, Psychology, Neuroscience, 030217 neurology & neurosurgery
Abstract

International audience; Hypometabolism has been observed in the contralesional cerebellum hemisphere after various cortical lesions, and is referred as crossed cerebellar diaschisis. It is unknown whether it can be measured after awake surgery for brain diffuse low-grade glioma. Using resting state fMRI we suggest that crossed cerebellar diaschisis can be assessed postoperatively.

Published
2015

34. Electronic and Vibrational Properties of Allene Carotenoids

Author

Mindaugas Macernis, Simona Streckaite, Radek Litvin, Andrew A. Pascal, Manuel J. Llansola-Portoles, Bruno Robert, Leonas Valkunas, Institute of Chemical Physics, Faculty of Physics, Vilnius University, Institut de Biologie Intégrative de la Cellule (I2BC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire Bioénergétique Membranaire et Stress (LBMS), Département Biochimie, Biophysique et Biologie Structurale (B3S), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Biologie Intégrative de la Cellule (I2BC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Biology Centre, Czech Academy of Sciences, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Université de Montpellier (UM), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Department of Theoretical Physics, Faculty of Physics, Vilnius University, and ANR-20-CE11-0022,Excit,Structure des états excités au cours du processus photosynhtétique(2020)

Subjects
carotenids, Alkadienes, resonant Raman, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Electronics, Physical and Theoretical Chemistry, Spectrum Analysis, Raman, Carotenoids
Abstract

International audience; Carotenoids are conjugated linear molecules built from the repetition of terpene units, which display a large structural diversity in nature. They may, in particular, contain several types of side or end groups, which tune their functional properties, such as absorption position and photochemistry. We report here a detailed experimental study of the absorption and vibrational properties of allene-containing carotenoids, together with an extensive modeling of these experimental data. Our calculations can satisfactorily explain the electronic properties of vaucheriaxanthin, where the allene group introduces the equivalent of one CC double bond into the conjugated CC chain. The position of the electronic absorption of fucoxanthin and butanoyloxyfucoxanthin requires long-range corrections to be found correctly on the red side of that of vaucheriaxanthin; however, these corrections tend to overestimate the effect of the conjugated and nonconjugated CO groups in these molecules. We show that the resonance Raman spectra of these carotenoids are largely perturbed by the presence of the allene group, with the two major Raman contributions split into two components. These perturbations are satisfactorily explained by modeling, through a gain in the Raman intensity of the CC antisymmetric stretching mode, induced by the presence of the allene group in the carotenoid CC chain.

Published
2022

35. Mesoporous organosilicas with thiol functionalised pores: multifunctional dendrimers as sacrificial building block and template

Author

Mathilde Laird, Niklas Herrmann, Carole Carcel, Philippe Trens, Erwan Oliviero, Guillaume Toquer, Rozenn Le Parc, Jean-Louis Bantignies, John R. Bartlett, Michel Wong Chi Man, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Université de Montpellier (UM), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), and Western Sydney University

Subjects
General Materials Science, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; The synthesis of multifunctional poly(amidoamine)(PAMAM)-based dendrimers containing a cleavable disulfide linkerwithin each armof the dendrimer, together with condensable triethoxysilyl groups on the periphery of the dendrimer, isdescribed. The dendrimers were mixed with bis(triethoxysilyl)benzene and subsequently transformed into silsesquioxanegels or periodic mesoporous organosilicas (PMOs) to generate materials with dendrimers covalently embedded within theinterior of the silsesquioxane networks. Subsequent treatment of the gels with dithiothreitol enabled the core of thedendrimers to be selectively cleaved at the disulfidesite, thus generating thiol functions localised within the pores.The effect of different dendrimer generations on the reactivity of the pendant thiol functions was probed by impregnationwith gold salts, which were reduced to obtain gold nanoparticleswithin the pore networks of the gels and PMOs. The gelsyielded polydisperse gold nanoparticles (2 to 70 nm) with dimensions modulated by the generation of thedendrimer,together with well-defined gold/thiolate clusters with Au...S distances of 2.3 Å. Suchclusters were also observed in the PMOsystem, together with monodispersed gold nanoparticles with diameters comparable to that of the organised pores in thePMO. The role of surface functionalisation in controlling the formation of gold clusters and/or nanoparticles is discusse

Published
2022

36. Discussion about suitable applications for biodegradable plastics regarding their sources, uses and end of life

Author

Ika Paul-Pont, Jean-François Ghiglione, Emmanuelle Gastaldi, Alexandra Ter Halle, Arnaud Huvet, Stéphane Bruzaud, Fabienne Lagarde, François Galgani, Guillaume Duflos, Matthieu George, Pascale Fabre, Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Océanographie Microbienne (LOMIC), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM), Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), SMODD - Systèmes Moléculaires Organisés et Développement Durable (SMODD), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), Institut de Recherche Dupuy de Lôme (IRDL), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire de sécurité des aliments de Maisons-Alfort (LSAl), Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), GDR 2050 'Polymers and Oceans', created by the CNRS, and French Ministry of Ecological Transition

Subjects
[SDV.EE]Life Sciences [q-bio]/Ecology, environment, [SDE.IE]Environmental Sciences/Environmental Engineering, Biodegradable, Plastic, Ecosafety, Waste Management and Disposal, Waste management
Abstract

International audience; This opinion paper offers a scientific view on the current debate of the place of biodegradable plastics as part of the solution to deal with the growing plastic pollution in the world's soil, aquatic, and marine compartments. Based on the current scientific literature, we focus on the current limits to prove plastic biodegradability and to assess the toxicity of commercially used biobased and biodegradable plastics in natural environments. We also discuss the relevance of biodegradable plastics for selected applications with respect to their use and end of life. In particular, we underlined that there is no universal biodegradability of plastics in any ecosystem, that considering the environment as a waste treatment system is not acceptable, and that the use of compostable plastics requires adaptation of existing organic waste collection and treatment channels.

Published
2023

37. Core–Shell Multiwalled Carbon Nanotube/Cobalt Corrole Hybrids for the Oxygen Reduction Reaction

Author

Paul-Gabriel Julliard, Manel Hanana, Laurent Alvarez, Renaud Cornut, Bruno Jousselme, Gabriel Canard, Stéphane Campidelli, Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Innovation en Chimie des Surfaces et NanoSciences (LICSEN UMR 3685), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), GDR Mapyro, ANR-14-JTIC-0002,MECANO,Ingenierie moléculaire et assemblages contrôlés de nanoobjets fonctionnels à base de porphyrines(2014), and ANR-10-LABX-0035,Nano-Saclay,Paris-Saclay multidisciplinary Nano-Lab(2010)

Subjects
oxygen reduction reaction, Fuel Technology, cobalt corroles, carbon nanotubes, General Chemical Engineering, Energy Engineering and Power Technology, [CHIM.COOR]Chemical Sciences/Coordination chemistry
Abstract

International audience; The development of hybrid nanomaterials that preserve and combine the properties of their constituents is a central issue of nanosciences. Herein, we describe the polymerization via CuAAC (copper-catalyzed azide-alkyne cycloaddition) of cobalt(III) corroles around conductive carbon nanotubes to produce chemically robust hybrid catalysts for Oxygen Reduction Reaction (ORR). A combination of techniques including UV-Vis-NIR absorption, Raman and X-ray Photoelectron Spectroscopy (XPS) as well as Scanning Electron Microscopy (SEM) were used to characterize the assembly of the two parts of the functional hybrid system for which the activity and the selectivity toward the ORR process in acidic media are enlightened by a combination of Rotating Disk Electrode (RDE) and Rotating Ring Disk Electrode (RRDE) measurements. The polymerized hybrid (click MWNT-CoCorr) exhibits an overpotential of ca. 230 mV compared to a reference platinum ink; the number of electrons involved in the reduction of oxygen is close to 3 in acidic media demonstrating that the corrole cobalt centers in the hybrids reduce oxygen via a mix of 2 and 4 electrons pathways.

Published
2023

38. Creating bulk ultrastable glasses by random particle bonding

Author

Misaki Ozawa, Yasutaka Iwashita, Walter Kob, Francesco Zamponi, Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy ), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Kyoto Sangyo University, Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Systèmes Désordonnés et Applications, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), and European Project: 723955,GlassUniversality

Subjects
Multidisciplinary, Statistical Mechanics (cond-mat.stat-mech), Soft Condensed Matter (cond-mat.soft), FOS: Physical sciences, General Physics and Astronomy, Disordered Systems and Neural Networks (cond-mat.dis-nn), General Chemistry, Condensed Matter - Soft Condensed Matter, Condensed Matter - Disordered Systems and Neural Networks, [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], Condensed Matter - Statistical Mechanics, General Biochemistry, Genetics and Molecular Biology
Abstract

A recent breakthrough in glass science has been the synthesis of ultrastable glasses via physical vapor deposition techniques. These samples display enhanced thermodynamic, kinetic and mechanical stability, with important implications for fundamental science and technological applications. However, the vapor deposition technique is limited to atomic, polymer and organic glass-formers and is only able to produce thin film samples. Here, we propose a novel approach to generate ultrastable glassy configurations in the bulk, via random particle bonding, and using computer simulations we show that this method does indeed allow for the production of ultrastable glasses. Our technique is in principle applicable to any molecular or soft matter system, such as colloidal particles with tunable bonding interactions, thus opening the way to the design of a large class of ultrastable glasses., 8 pages, 6 figures + supplementary information. Improved version thanks to referees' comments

Published
2023

39. Silicon based terahertz radiation detectors

Author

But , Dmytro, Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Université Montpellier II - Sciences et Techniques du Languedoc, Wojciech Knap, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Wojciek Knap, and STAR, ABES

Subjects
[PHYS.PHYS]Physics [physics]/Physics [physics], Terahertz, Plasma wave, [PHYS.PHYS] Physics [physics]/Physics [physics], Transistors, [ PHYS.PHYS ] Physics [physics]/Physics [physics], Onde de plasma
Abstract

This thesis is devoted to study of terahertz detectors based on field-effect transistors fabricated using silicon technology and they comparison to InGaAs/InP ones. The main research effort was devoted to the problem of detectors linearity at high radiation intensities. The photoresponse of field effect transistors to terahertz radiation in a wide range of intensities: from 0.5 mW/cm2 up to 500 kW/cm2 and for frequencies from 0.13 THz to 3.3 THz was studied. This work shows that the photoresponse of all studied detectors increases linearly with increasing radiation intensity up to a few kW/cm2 range and is followed by the nonlinear and saturation parts for higher radiation intensities. This effect has led to the new model of broadband field-effect transistor detectors. The model is based on the phenomenological knowledge of the transistor static transfer characteristic and explains the photoresponse nonlinearity as related to non-linearity and saturation of the transistor channel current. The developed model explains consistently experimental data both in linear and nonlinear regions of terahertz detection., Cette thèse est consacrée à l'étude des détecteurs de radiation THz basés sur des transistors à effet de champ qui ont été fabriqués en utilisant les technologies différentes. La photo-réponse de transistors à effet de champ a été étudiée dans une large gamme d'intensités de radiation: de 0,5 mW/cm2 à 500 kW/cm2, et pour des fréquences allant de 0,13 THz à 3,3 THz. Les détecteurs montrent la photo-réponse linéaire en fonction de l'intensité du rayonnement dans une large gamme d'intensités, jusqu'à plusieurs kW/cm2. Pour toutes les fréquences, nous avons observé que la région linéaire a été suivie par une partie non linéaire et ensuite par une saturation. Cet effet a conduit à un nouveau modèle de détecteurs FET à large bande qui est basé sur la connaissance phénoménologique de caractéristiques statiques de transistor. Le modèle prend en compte le comportement non linéaire du courant dans le canal dans toute une plage de fonctionnement du transistor, ce qui est particulièrement important à des intensités élevées de rayonnement THz. Les données expérimentales ont été interprétées avec succès dans le cadre du modèle développé.

Published
2014

40. Numerical modeling of wheat fractionation role of starch volume fraction

Author

CHICHTI , Emna, Affes , Rafik, George , Matthieu, Lullien-Pellerin , Valerie, Radjai , Farhang, Delenne , Jean-Yves, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), and Laboratoire Charles Coulomb ( L2C )

Subjects
modelling, amidon, starch, [SDV.IDA]Life Sciences [q-bio]/Food engineering, [ SDV.IDA ] Life Sciences [q-bio]/Food engineering, Ingénierie des aliments, Food engineering, food and beverages, fractionation, fractionnement, grain de blé, modélisation
Abstract

Wheat endosperm is a cemented granular material composed of a binary-sized mixture of almost spherical starch granules bounded to one another with an amorphous protein matrix. The milling properties of wheat grains depend on this typical microstructure, largely controlled by the genetic background and the growing conditions. An original Atomic Force Microscopy nano-scratch methodology has been developed [1] to assess the local rheological properties of the protein matrix, the starch granules and their interface. The determined relative stiffness and failure strength, together with information on the phase distribution, were then used to construct 2D numerical samples of wheat endosperm. The granular structure of the sample with different granular packing was computed using a Molecular Dynamics approach. The protein matrix was added in the form of bridges connecting neighboring particles. The samples were then meshed using a triangular lattice of one-dimensional spring elements that were characterized by stiffness and yield force. The rheological properties of each element were set according to the location of its two nodes leading to five different elements: starch, matrix, starch-matrix, starch-starch and voids. The samples were then subjected to an increasing uniaxial tensile stress until failure using an iterative procedure based on conjugate gradient minimization. The Lattice Element Method, developed by Topin [2,3], was used for the simulations and a parametric study was performed where the protein content, the starch granular packing and the starch-protein adhesion, suggested to be responsible of the wheat fragmentation, were varied. The results showed that, depending on the sample porosity, the bulk elastic properties do not follow the mixing law of diluted composites, highlighting the granular backbone effect of percolating particles. A non-linear evolution of the bulk elastic modulus as a function of the sample porosity was also noted, with little effect of the granule solid fraction. Concerning the failure properties, the results showed that the particle volume fraction has a greater influence on the yield stress at high starch-protein adhesion and that for the same porosity, increasing particles volume fraction leads to higher yield stress. Finally, we noted that the yield stress strongly depends on the sample porosity at high starch-protein adhesion and is weakly affected by the porosity at low adhesion, whatever the particle volume fractions.

Published
2014

41. How is salt taste intensity encoded within the human brain? The responses of BOLD fMRI using food models

Author

Iranpour, Juliana, Clerjon, Sylvie, Morrot, Gil, Claise, Béatrice, Jean, Betty, Thomas-Danguin, Thierry, Bonny, Jean-Marie, Qualité des Produits Animaux (QuaPA), Institut National de la Recherche Agronomique (INRA), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Sciences et Techniques, CHU Clermont-Ferrand, Centre des Sciences du Goût et de l'Alimentation [Dijon] (CSGA), Centre National de la Recherche Scientifique (CNRS)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB), Qualité des Produits Animaux ( QUAPA ), Institut National de la Recherche Agronomique ( INRA ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Centre Hospitalier Universitaire de Clermont-Ferrand, Centre des Sciences du Goût et de l'Alimentation [Dijon] ( CSGA ), Institut National de la Recherche Agronomique ( INRA ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique ( CNRS ), Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), and ProdInra, Archive Ouverte

Subjects
[SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, [ SDV.AEN ] Life Sciences [q-bio]/Food and Nutrition, [ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], [SDV.NEU] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition
Abstract

Functional MRI (fMRI) allows understanding the mechanisms by which sensations induced by food cues are perceived and processed within the brain, under the influence of various external (e.g. visual stimuli) and internal factors (e.g. body state). In particular, it allows analyzing at neurophysiological level how food formulations influence their sensory qualities and the pleasure experienced. Here, we used fMRI to infer several neural correlates of the perceived salty intensity produced by rewarding food models. Subjects received different savory solutions on their tongue using an MR-compatible gustatometer. The activations were mapped from smoothed high-resolution data, an imaging protocol providing good functional sensitivity in the gustatory cortex [1]. Two primary areas for taste processing were presumed in the human brain, intercepting the operculo-insular cortex and the lesser-known postcentral gyrus. We found highly significant neural correlates of salt taste intensity at the base of the postcentral gyrus bilaterally and to a lesser extent in the insula and the overlying operculi. This finding suggests that both primary areas were involved in salt taste intensity coding in human brain, which contrasts with previous results obtained with unpleasant salty solutions. We speculate that it may result from the use of rewarding food models, making it necessary to take specific account of the stimulation context for mimicking the brain’s integration of sensory rewards during normal feeding.[1] Iranpour J, Morrot G, Claise B, Jean B, Bonny J-M. Using high resolution to improve BOLD fMRI detection in gustatory cortices. Human Brain Mapping. Submitted.

Published
2014

42. Observation of three-dimensional massless Kane fermions in a zinc-blende crystal

Author

Gerard Martinez, Clément Faugeras, S. A. Dvoretskii, V. I. Gavrilenko, Denis M. Basko, M. S. Zholudev, A. L. Barra, Wojciech Knap, Frederic Teppe, Marek Potemski, Petr Neugebauer, Nikolay N. Mikhailov, Milan Orlita, Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Laboratoire de physique et modélisation des milieux condensés (LPM2C), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institute for Physics of Microstructures of the RAS, Russian Academy of Sciences [Moscow] (RAS), Institute of semiconductor Physics, Laboratoire national des champs magnétiques intenses - Grenoble ( LNCMI ), Centre National de la Recherche Scientifique ( CNRS ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Joseph Fourier - Grenoble 1 ( UJF ) -Université Grenoble Alpes ( UGA ), Laboratoire de physique et modélisation des milieux condensés ( LPM2C ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Laboratoire Charles Coulomb ( L2C ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Institute for Physics of Microstructures, Russian Academy of Sciences [Moscow] ( RAS ), Institute of Semiconductor Physics, Université du Québec, Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Photon, Condensed matter physics, [ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph], Graphene, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], General Physics and Astronomy, Fermion, Electron, Landau quantization, law.invention, Massless particle, law, Topological insulator, Dispersion relation, Quantum mechanics, ComputingMilieux_MISCELLANEOUS
Abstract

http://arxiv.org/abs/1310.0969 The authors acknowledge helpful discussions with T. Brauner, R. Grill, M. Grynberg, A. A. Nersesyan, V. Novák, M. L. Sadowski and W. Zawadzki. The work has been supported by the ERC project MOMB, by EuroMagNET II under the EU Contract No. 228043, by the GDR-I project 'Semiconductor sources and detectors of THz frequencies' and by the Scientific Council of Montpellier II University. We also acknowledge the support received from the Ambassade de France en Russie for the French-Russian collaboration and exchange of PhD students.; International audience; Solid-state physics and quantum electrodynamics, with its ultrarelativistic (massless) particles, meet in the electronic properties of one-dimensional carbon nanotubes, two-dimensional graphene or topological-insulator surfaces. However, clear experimental evidence for electronic states with a conical dispersion relation in all three dimensions, conceivable for certain bulk materials, is still missing. Here, we study a zinc-blende crystal, HgCdTe, at the point of the semiconductor-to-semimetal topological transition. For this compound, we observe three-dimensional massless electrons, as certified from the dynamical conductivity increasing linearly with the photon frequency, with a velocity of about 106 m s−1. Applying a magnetic field B results in a -dependence of dipole-active inter-Landau-level resonances and spin splitting of Landau levels also following a -dependence--well-established signatures of ultrarelativistic particles but until now not observed experimentally in any solid-state electronic system.

Published
2014

43. Conformal TBA for Resolved Conifolds

Author

Sergei Alexandrov, Boris Pioline, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics - Theory, Nuclear and High Energy Physics, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], FOS: Physical sciences, Conformal map, 01 natural sciences, String (physics), Mathematics - Algebraic Geometry, [MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph], 0103 physical sciences, FOS: Mathematics, Number Theory (math.NT), Limit (mathematics), 0101 mathematics, Algebraic Geometry (math.AG), Mathematical Physics, Mathematics, Mathematical physics, Partition function (quantum field theory), Conifold, Mathematics - Number Theory, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], 010102 general mathematics, Statistical and Nonlinear Physics, Mathematical Physics (math-ph), Function (mathematics), 16. Peace & justice, [MATH.MATH-NT]Mathematics [math]/Number Theory [math.NT], High Energy Physics - Theory (hep-th), Crepant resolution, [MATH.MATH-AG]Mathematics [math]/Algebraic Geometry [math.AG], 010307 mathematical physics, Asymptotic expansion
Abstract

We revisit the Riemann-Hilbert problem determined by Donaldson-Thomas invariants for the resolved conifold and for other small crepant resolutions. While this problem can be recast as a system of TBA-type equations in the conformal limit, solutions are ill-defined due to divergences in the sum over infinite trajectories in the spectrum of D2-D0-brane bound states. We explore various prescriptions to make the sum well-defined, show that one of them reproduces the existing solution in the literature, and identify an alternative solution which is better behaved in a certain limit. Furthermore, we show that a suitable asymptotic expansion of the $\tau$ function reproduces the genus expansion of the topological string partition function for any small crepant resolution. As a by-product, we conjecture new integral representations for the triple sine function, similar to Woronowicz' integral representation for Faddeev's quantum dilogarithm., Comment: 25+14 pages; added proof for integral representation of the double sine function and a similar conjecture for the triple sine; version accepted for publication in Annales Henri Poincar\'e

Published
2021

44. Shear-banding fluid(s) under time-dependent shear flows. Part II: A test of the Moorcroft–Fielding criteria

Author

Julien Browaeys, Laura Casanellas, Alice Briole, Marc-Antoine Fardin, Charlotte Py, Sandra Lerouge, Olivier Cardoso, Matière et Systèmes Complexes (MSC (UMR_7057)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut Jacques Monod (IJM (UMR_7592)), Unité Sanitaire de la Faune, Office National de la Chasse et de la Faune Sauvage (ONCFS), and Université de Paris (UP)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Steady state, Rheometry, Mechanical Engineering, Flow (psychology), Mechanics, Condensed Matter Physics, 01 natural sciences, Instability, 010305 fluids & plasmas, Physics::Fluid Dynamics, Shear (sheet metal), Stress (mechanics), Rheology, Particle image velocimetry, Mechanics of Materials, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], General Materials Science, 010306 general physics, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

Complex systems often exhibit shear banding—the coexistence of two different states characterized by their internal structuring and local shear rates. For some of them, the heterogeneous flow corresponds to the final steady-state response, while for others, shear banding can only be transient, the banding structure healing back to a homogeneous flow in the ultimate steady state after long-lived periods. In order to explain the diversity of observations, Moorcroft and Fielding have established general criteria for the onset of banding in time-dependent flows of complex systems, ranging from polymeric fluids to soft glassy materials [Moorcroft et al., Phys. Rev. Lett. 110, 086001 (2013)]. The proposed criteria are based on the time evolution of the bulk rheological response function of the system to a given time-dependent flow protocol and are associated with a specific signature in the mechanical response. In this contribution, we test the validity of these criteria in the case of two common time-dependent flow protocols: a step stress and a shear startup. Two types of fluids are examined. On the one hand, a wormlike micelles system exhibiting steady shear banding is studied experimentally, using rheometry coupled with direct visualizations and particle image velocimetry. On the other hand, we analyze previous literature on yield stress fluids exhibiting transient shear banding. Under conditions of a constant imposed stress, for both types of fluids, the onset of banding arises in a time window compatible with the Moorcroft–Fielding criterion. However, the mechanical signature, i.e., the shape of the bulk mechanical signal as a function of time, is not the one expected within some of the specific models with which the general Moorcroft–Fielding criteria were tested numerically. Under shear startup, both types of fluids behave differently. The criterion holds for yield stress fluids, the onset of banding arising just after the stress overshoot, as expected. On the contrary, for wormlike micelles, the window of instability is delayed, even if the overshoot clearly plays a crucial role in the nucleation of shear-induced structures. Regardless of the flow protocol or the system, wall slip seems to go hand in hand with banding indicating that it is a key ingredient to take into account.

Published
2021

45. The influence of technological changes in energy efficiency on the infrastructure deterioration in the energy sector

Author

B. Gil, M.Yu. Shabalov, A. D. Buldysko, Y. L. Zhukovskiy, V.V. Starshaia, Saint Petersburg Mining University, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)

Subjects
020209 energy, media_common.quotation_subject, Global challenges, Control (management), 02 engineering and technology, Modernization theory, 7. Clean energy, [SPI]Engineering Sciences [physics], 020401 chemical engineering, Infrastructure deterioration, Technological changes, Sustainable development, 0202 electrical engineering, electronic engineering, information engineering, Quality (business), 0204 chemical engineering, ComputingMilieux_MISCELLANEOUS, media_common, Consumption (economics), 9. Industry and infrastructure, business.industry, Technological change, Sustainable energy, Corporate governance, Information technology, Environmental economics, TK1-9971, General Energy, 13. Climate action, [SDE]Environmental Sciences, Digital technologies, Electrical engineering. Electronics. Nuclear engineering, Business, Efficient energy use
Abstract

The energy and its entire related infrastructure are the main drivers for a economic development and for ensuring a good level of employment. As part of a global study about international energy sector, we evaluate here the impact of technological changes on the state of the energy infrastructure. This study includes a detailed analysis of the global challenges facing the energy industry. We propose scenarios for the development of a modernized energy infrastructure with an assessment of the entire energy system. Our evaluation indicators are chosen in terms of the reliability of the energy infrastructure, of its quality, of the accidents that may happen and of the consequent environmental risks. This study is particularly adapted for forecasting the necessary measures (of technical nature, of governance kind) that have to be implemented to reduce the acceleration of the infrastructure deterioration rate. Our results reveal that the use of digital and information technologies has many positive impacts on the development and on the control of an efficient consumption of energy. In addition, our predictions, due to the further modernization of the energy sector, can contribute and help in the creation of preconditions that will be highly stimulating and profitable to the growth of investments in the energy infrastructure.

Published
2021

46. Domain Decomposition Spectral Method Applied to Modal Method: Direct and Inverse Spectral Transforms

Author

Kofi Edee, Gérard Granet, Francoise Paladian, Pierre Bonnet, Ghida Al Achkar, Lana Damaj, Jean-Pierre Plumey, Maria Cristina Larciprete, Brahim Guizal, Institut Pascal (IP), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA), University of California (UC), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), and Collaboration au sein du KAVLI Institute of Theoretical Physics durant l'été 2022. Financement obtenu en partie par l'Université de Montpellier.

Subjects
Metasurfaces, Domain décomposition method, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], metalens, metasurfaces, Electrical and Electronic Engineering, Biochemistry, Instrumentation, Atomic and Molecular Physics, and Optics, Analytical Chemistry, Modal Methods
Abstract

International audience; We introduce a Domain Decomposition Spectral Method (DDSM) as a solution for Maxwell’s equations in the frequency domain. It will be illustrated in the framework of the Aperiodic Fourier Modal Method (AFMM). This method may be applied to compute the electromagnetic field diffracted by a large-scale surface under any kind of incident excitation. In the proposed approach, a large-size surface is decomposed into square sub-cells, and a projector, linking the set of eigenvectors of the large-scale problem to those of the small-size sub-cells, is defined. This projector allows one to associate univocally the spectrum of any electromagnetic field of a problem stated on the large-size domain with its footprint on the small-scale problem eigenfunctions. This approach is suitable for parallel computing, since the spectrum of the electromagnetic field is computed on each sub-cell independently from the others. In order to demonstrate the method’s ability, to simulate both near and far fields of a full three-dimensional (3D) structure, we apply it to design large area diffractive metalenses with a conventional personal computer.

Published
2022

47. Association of Early Norepinephrine Administration With 24-Hour Mortality Among Patients With Blunt Trauma and Hemorrhagic Shock

Author

Gauss, Tobias, Richards, Justin, Tortù, Costanza, Ageron, François-Xavier, Hamada, Sophie, Josse, Julie, Husson, François, Harrois, Anatole, Scalea, Thomas, Vivant, Valentin, Meaudre, Eric, Morrison, Jonathan, Galvagno, Samue, Bouzat, Pierre, Albasini, François, Briot, Olivier, Chaboud, Laurent, Chateigner Coelsch, Sophie, Chaumat, Alexandre, Comlar, Thomas, Debas, Olivier, Debaty, Guillaume, Dupré-Nalet, Emmanuelle, Gay, Samuel, Ginestie, Edouard, Girard, Edouard, Grèze, Jules, Haesevoets, Marc, Hallain, Marie, Haller, Etienne, Hoareau, Christophe, Lanaspre, Bernard, Lespinasse, Safia, Levrat, Albrice, Mermillod-Blondin, Romain, Nicoud, Philippe, Rancurel, Elisabeth, Thouret, Jean-Marc, Vallenet, Claire, Vallot, Cécile, Zerr, Bénédicte, Abback, Paér-Sélim, Audibert, Gérard, Boutonnet, Mathieu, Clavier, Thomas, Cook, Fabrice, Eljamri, Mohamed, Floch, Thierry, Gaertner, Elisabeth, Garrigue, Delphine, Geeraerts, Thomas, Gette, Sebastien, Godier, Anne, Gosset, Pierre, Hanouz, Jean-Luc, Moyer, Jean-Denis, Langeron, Olivier, Leone, Marc, Pottecher, Julien, Portaz, Jonathan, Raux, Mathieu, Scotto, Marion, Willig, Mathieu, Hardy, Alexia, French Trauma Research Initiative, Albasini, F., Briot, O., Chaboud, L., Chateigner Coelsch, S., Chaumat, A., Comlar, T., Debas, O., Debaty, G., Dupré-Nalet, E., Gay, S., Ginestie, E., Girard, E., Grèze, J., Haesevoets, M., Hallain, M., Haller, E., Hoareau, C., Lanaspre, B., Lespinasse, S., Levrat, A., Mermillod-Blondin, R., Nicoud, P., Rancurel, E., Thouret, J.M., Vallenet, C., Vallot, C., Zerr, B., Abback, P.S., Audibert, G., Boutonnet, M., Clavier, T., Cook, F., Eljamri, M., Floch, T., Gaertner, E., Garrigue, D., Geeraerts, T., Gette, S., Godier, A., Gosset, P., Hanouz, J.L., Moyer, J.D., Langeron, O., Leone, M., Pottecher, J., Portaz, J., Raux, M., Scotto, M., Willig, M., Hardy, A., Hôpital Beaujon [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Hôpital d'Annecy, Centre de recherche en épidémiologie et santé des populations (CESP), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Paul Brousse-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay, Inria-SIC [Sophia Antipolis], Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Institut Desbrest de santé publique (IDESP), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Médecine de précision par intégration de données et inférence causale (PREMEDICAL), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut Desbrest de santé publique (IDESP), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Institut de Recherche Mathématique de Rennes (IRMAR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École normale supérieure - Rennes (ENS Rennes)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut Agro Rennes Angers, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Hôpital Bicêtre, Université Paris-Saclay, Hôpital d'Instruction des Armées Sainte Anne, Service de Santé des Armées, École du Val de Grâce (EVDG), CHU Grenoble, [GIN] Grenoble Institut des Neurosciences (GIN), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Grenoble Alpes (UGA), Hopital Saint-Jean-de-Maurienne, Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), and ANR-11-LABX-0020,LEBESGUE,Centre de Mathématiques Henri Lebesgue : fondements, interactions, applications et Formation(2011)

Subjects
Male, Norepinephrine, [MATH.MATH-ST]Mathematics [math]/Statistics [math.ST], Humans, Hemorrhage, General Medicine, Middle Aged, Shock, Hemorrhagic, Wounds, Nonpenetrating, Hemorrhage/drug therapy, Norepinephrine/therapeutic use, Retrospective Studies, Shock, Hemorrhagic/drug therapy, Wounds, Nonpenetrating/complications, Wounds, Nonpenetrating/drug therapy
Abstract

ImportanceHemorrhagic shock is a common cause of preventable death after injury. Vasopressor administration for patients with blunt trauma and hemorrhagic shock is often discouraged.ObjectiveTo evaluate the association of early norepinephrine administration with 24-hour mortality among patients with blunt trauma and hemorrhagic shock.Design, Setting, and ParticipantsThis retrospective, multicenter, observational cohort study used data from 3 registries in the US and France on all consecutive patients with blunt trauma from January 1, 2013, to December 31, 2018. Patients were alive on admission with hemorrhagic shock, defined by prehospital or admission systolic blood pressure less than 100 mm Hg and evidence of hemorrhage (ie, prehospital or resuscitation room transfusion of packed red blood cells, receipt of emergency treatment for hemorrhage control, transfusion of >10 units of packed red blood cells in the first 24 hours, or death from hemorrhage). Blunt trauma was defined as any exposure to nonpenetrating kinetic energy, collision, or deceleration. Statistical analysis was performed from January 15, 2021, to February 22, 2022.ExposureContinuous administration of norepinephrine in the prehospital environment or resuscitation room prior to hemorrhage control, according to European guidelines.Main Outcomes and MeasuresThe primary outcome was 24-hour mortality, and the secondary outcome was in-hospital mortality. The average treatment effect (ATE) of early norepinephrine administration on 24-hour mortality was estimated according to the Rubin causal model. Inverse propensity score weighting and the doubly robust approach with 5 distinct analytical strategies were used to determine the ATE.ResultsA total of 52 568 patients were screened for inclusion, and 2164 patients (1508 men [70%]; mean [SD] age, 46 [19] years; median Injury Severity Score, 29 [IQR, 17-36]) presented with acute hemorrhage and were included. A total of 1497 patients (69.1%) required emergency hemorrhage control, 128 (5.9%) received a prehospital transfusion of packed red blood cells, and 543 (25.0%) received a massive transfusion. Norepinephrine was administered to 1498 patients (69.2%). The 24-hour mortality rate was 17.8% (385 of 2164), and the in-hospital mortality rate was 35.6% (770 of 2164). None of the 5 analytical strategies suggested any statistically significant association between norepinephrine administration and 24-hour mortality, with ATEs ranging from –4.6 (95% CI, –11.9 to 2.7) to 2.1 (95% CI, –2.1 to 6.3), or between norepinephrine administration and in-hospital mortality, with ATEs ranging from –1.3 (95% CI, –9.5 to 6.9) to 5.3 (95% CI, –2.1 to 12.8).Conclusions and RelevanceThe findings of this study suggest that early norepinephrine infusion was not associated with 24-hour or in-hospital mortality among patients with blunt trauma and hemorrhagic shock. Randomized clinical trials that study the effect of early norepinephrine administration among patients with trauma and hypotension are warranted to further assess whether norepinephrine is safe for patients with hemorrhagic shock.

Published
2022

48. Unusual anharmonicity and pseudospin-phonon dynamics in 3D halide perovskites

Author

Even, Jacky, Hehlen, Bernard, Bourges, Philippe, Rufflé, Benoit, Létoublon, Antoine, Zacharias, Marios, Katan, Claudine, Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), LLB - Nouvelles frontières dans les matériaux quantiques (NFMQ), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and European Project: 899141,PoLLoC

Subjects
[PHYS]Physics [physics], [CHIM]Chemical Sciences
Abstract

International audience; 3D halide perovskites used in light emitters and PV systems exhibit an unusual anharmonicity, which is not accounted for in nowadays descriptions of phonons and electron-phonon coupling. Therefore, the low frequency lattice vibrations and relaxations were investigated in single crystals of the four 3D hybrid organolead perovskites, MAPbBr3, FAPbBr3, MAPbI3, and FAPbI3, at the Brillouin zone center using Raman and Brillouin scattering and at the zone boundary using inelastic neutron scattering. The temperature dependence of the PbX6 lattice modes in the four compounds can berenormalized into universal curves and no soft vibration is observed excluding a displacive-like transitional dynamics related to structural phase transitions. The reorientational (pseudospin) motions of the molecular cations exhibit a seemingly order-disorder character recalling that of plastic crystals, but attributed to a secondary order-parameter. At ultra-low frequency, a quasi-elastic component evidenced by Brillouin scattering and associated to the unresolved central peak observed in neutron scattering, is attributed to center of mass anharmonic motions and rattling of the molecular cations in the perovskite cavities. 3D halide perovskites are therefore in a very unusualsituation where anharmonicity prevails. It is leading to partial, extensive and ultraslow critical and stochatic dynamics connected to structural instabilities. The extensive disorder of the lattice at normal operation temperatures for devices is similar to premelting where only long-range acoustic normal modes survive.

Published
2022

49. Long-range electrodynamic interactions between proteins assessed by THz spectroscopy

Author

Ruffenach, Sandra, Lechelon, Mathias, Meriguet, Yoann, Gori, Matteo, Nardecchia, Ilaria, Floriani, Elena, Coquillat, Dominique, Teppe, Frédéric, Mailfert, Sebastien, Ferrier, Pierre, Varani, Luca, Sturgis, James, Marguet, Didier, Pettini, Marco, Torres, Jeremie, Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Centre d'Immunologie de Marseille - Luminy (CIML), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique - UMR 7332 (CPT), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), CPT - E7 Systèmes dynamiques : théories et applications, Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut d’Electronique et des Systèmes (IES), Modélisation et Spectroscopie THz (MOST), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Laboratoire d'ingénierie des systèmes macromoléculaires (LISM), and European Project: 964203,FET-Open LINkS

Subjects
[PHYS]Physics [physics]
Abstract

International audience

Published
2022

50. Analysis of the multilayer organization of a sunflower leaf during dehydration with terahertz time-domain spectroscopy

Author

Yannick Abautret, Dominique Coquillat, Michel Lequime, Myriam Zerrad, Claude Amra, Institut FRESNEL (FRESNEL), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Aix Marseille Université (AMU), and École Centrale de Marseille (ECM)

Subjects
Plant Leaves, Terahertz Spectroscopy, [PHYS]Physics [physics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Dehydration, [PHYS.PHYS]Physics [physics]/Physics [physics], Helianthus, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic and Molecular Physics, and Optics
Abstract

International audience; We apply reverse engineering techniques (RET) to analyze the dehydration process of a sunflower leaf with terahertz time-domain spectroscopy. The multilayer structure of the leaf is extracted with accuracy during the entire process. Time variations of thickness and the complex index are emphasized for all leaf layers (2 cuticules, 2 epiderms, and 2 mesophylls). The global thickness of the sunflower leaf is reduced by up to 40% of its initial value.

Published
2022

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