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1. Encoding Information on the Excited State of a Molecular Spin Chain

Author

Di Wang, Ufuk Halisdemir, D. Spor, Bhavishya Chowrira, Daniel Lacour, Samy Boukari, K. Katcko, Martin Bowen, Arnaud Boulard, Victor Da Costa, L. M. Kandpal, Franck Ngassam, Damien Mertz, Eric Beaurepaire, Michel Hehn, Mebarek Alouani, C. Kieber, Torsten Scherer, François Montaigne, A. Bahouka, B. Leconte, E. Sternitzky, N. Beyer, Pierre Panissod, F. Schleicher, Jacek Arabski, E. Urbain, Wolfgang Weber, Christian Kübel, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institute of Nanotechnology [Karlsruhe] (INT), Karlsruhe Institute of Technology (KIT), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IREPA LASER (IREPA LASER), Technical University Darmstadt (TU), ANR-16-CE06-0004,NECtAR,Interfaces réactives pour la conversion d'énergie nanofluidique(2016), ANR-09-JCJC-0137,SpinMarvel,Memristive Optospintronics(2009), ANR-14-CE26-0009,Spinapse,Spinapses OptoElectroniques Interconnectées(2014), ANR-11-LABX-0058,NIE,Nanostructures en Interaction avec leur Environnement(2011), ANR-06-NANO-0033,SPINORGA,Transport polarise en spin dans des heterostructures metal ferromagnétique / molecule metalo-organique(2006), Lacour, Daniel, Interfaces réactives pour la conversion d'énergie nanofluidique - - NECtAR2016 - ANR-16-CE06-0004 - AAPG2016 - VALID, Jeunes chercheuses et jeunes chercheurs - Memristive Optospintronics - - SpinMarvel2009 - ANR-09-JCJC-0137 - JCJC - VALID, Appel à projets générique - Spinapses OptoElectroniques Interconnectées - - Spinapse2014 - ANR-14-CE26-0009 - Appel à projets générique - VALID, Nanostructures en Interaction avec leur Environnement - - NIE2011 - ANR-11-LABX-0058 - LABX - VALID, Programme National en Nanosciences et Nanotechnologies (PNANO) - Transport polarise en spin dans des heterostructures metal ferromagnétique / molecule metalo-organique - - SPINORGA2006 - ANR-06-NANO-0033 - PNANO - VALID, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Technische Universität Darmstadt - Technical University of Darmstadt (TU Darmstadt), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique

Subjects
Materials science, Spin states, Magnetoresistance, 02 engineering and technology, 01 natural sciences, 7. Clean energy, [PHYS] Physics [physics], Spin chain, Quantum technology, Biomaterials, Quantum state, 0103 physical sciences, Electrochemistry, Information encoding, 010306 general physics, Magnetic anisotropy, Spin-½, [PHYS]Physics [physics], Condensed matter physics, Spintronics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Excited state, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Ground state
Abstract

International audience; The quantum states of nano-objects can drive electrical transport properties across lateral and local-probe junctions. This raises the prospect, in a solid-state device, of electrically encoding information at the quantum level using spinflip excitations between electron spins. However, this electronic state has no defined magnetic orientation and is short-lived. Using a novel vertical nanojunction process, these limitations are overcome and this steady-state capability is experimentally demonstrated in solid-state spintronic devices. The excited quantum state of a spin chain formed by Co phthalocyanine molecules coupled to a ferromagnetic electrode constitutes a distinct magnetic unit endowed with a coercive field. This generates a specific steady-state magnetoresistance trace that is tied to the spin-flip conductance channel, and is opposite in sign to the ground state magnetoresistance term, as expected from spin excitation transition rules. The experimental 5.9 meV thermal energy barrier between the ground and excited spin states is confirmed by density functional theory, in line with macrospin phenomenological modeling of magnetotransport results. This low-voltage control over a spin chain's quantum state and spintronic contribution lay a path for transmitting spin wave-encoded information across molecular layers in devices. It should also stimulate quantum prospects for the antiferromagnetic spintronics and oxides electronics communities.

Published
2021
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2. Quantum advantage in a molecular spintronic engine that harvests thermal fluctuation energy

Author

Bhavishya Chowrira, Lalit Kandpal, Mathieu Lamblin, Franck Ngassam, Charles‐Ambroise Kouakou, Talha Zafar, Damien Mertz, Bertrand Vileno, Christophe Kieber, Gilles Versini, Benoit Gobaut, Loïc Joly, Tom Ferté, Elmer Monteblanco, Armel Bahouka, Romain Bernard, Sambit Mohapatra, Helena Prima Garcia, Safaa Elidrissi, Miguel Gavara, Emmanuel Sternitzky, Victor Da Costa, Michel Hehn, François Montaigne, Fadi Choueikani, Philippe Ohresser, Daniel Lacour, Wolfgang Weber, Samy Boukari, Mebarek Alouani, and Martin Bowen

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Mechanics of Materials, Mechanical Engineering, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Aucun, Termodinàmica, FOS: Physical sciences, General Materials Science, Energia
Abstract

Recent theory and experiments have showcased how to harness quantum mechanics to assemble heat/information engines with efficiencies that surpass the classical Carnot limit. So far, this has required atomic engines that are driven by cumbersome external electromagnetic sources. Here, using molecular spintronics, we propose an implementation that is both electronic and autonomous. Our spintronic quantum engine heuristically deploys several known quantum assets by having a chain of spin qubits formed by the paramagnetic Co centers of phthalocyanine (Pc) molecules electronically interact with electron-spin selecting Fe/C60 interfaces. Density functional calculations reveal that transport fluctuations across the interface can stabilize spin coherence on the Co paramagnetic centers, which host spin flip processes. Across vertical molecular nanodevices, we measure enduring dc current generation, output power above room temperature, two quantum thermodynamical signatures of the engine's processes, and a record 89% spin polarization of current across the Fe/C60 interface. It is crucially this electron spin selection that forces, through demonic feedback and control, charge current to flow against the built-in potential barrier. Further research into spintronic quantum engines, insight into the quantum information processes within spintronic technologies, and retooling the spintronic-based information technology chain, could help accelerate the transition to clean energy., \

Published
2020

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