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139 results on '"Wind, Shalom J."'

1. Observation of flat bands in gated semiconductor artificial graphene

Author

Du, Lingjie, Liu, Ziyu, Wind, Shalom J., Pellegrini, Vittorio, West, Ken W., Fallahi, Saeed, Pfeiffer, Loren N., Manfra, Michael J., and Pinczuk, Aron

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Flat bands near M points in the Brillouin zone are key features of honeycomb symmetry in artificial graphene (AG) where electrons may condense into novel correlated phases. Here we report the observation of van Hove singularity doublet of AG in GaAs quantum well transistors, which presents the evidence of flat bands in semiconductor AG. Two emerging peaks in photoluminescence spectra tuned by backgate voltages probe the singularity doublet of AG flat bands, and demonstrate their accessibility to the Fermi level. As the Fermi level crosses the doublet, the spectra display dramatic stability against electron density, indicating interplays between electron-electron interactions and honeycomb symmetry. Our results provide a new flexible platform to explore intriguing flat band physics., Comment: 11 pages, 4 figures, and Supplementary Material

Published
2021
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2. Fabrication of Artificial Graphene in a GaAs Quantum Heterostructure

Author

Scarabelli, Diego, Wang, Sheng, Kuznetsova, Yuliya Y., Pfeiffer, Loren N., West, Ken, Gardner, Geoff C., Manfra, Michael J., Pellegrini, Vittorio, Pinczuk, Aron, and Wind, Shalom J.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The unusual electronic properties of graphene, which are a direct consequence of its two-dimensional (2D) honeycomb lattice, have attracted a great deal of attention in recent years. Creation of artificial lattices that recreate graphene's honeycomb topology, known as artificial graphene, can facilitate the investigation of graphene-like phenomena, such as the existence of massless Dirac fermions, in a tunable system. In this work, we present the fabrication of artificial graphene in an ultra-high quality GaAs/AlGaAs quantum well, with lattice period as small as 50 nm, the smallest reported so far for this type of system. Electron-beam lithography is used to define an etch mask with honeycomb geometry on the surface of the sample, and different methodologies are compared and discussed. An optimized anisotropic reactive ion etching process is developed to transfer the pattern into the AlGaAs layer and create the artificial graphene. The achievement of such high-resolution artificial graphene should allow the observation for the first time of massless Dirac fermions in an engineered semiconductor., Comment: 13 pages text, 8 figures, plus references

Published
2015
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5. Heterobimetallic Base Pair Programming in Designer 3D DNA Crystals

Author

Lu, Brandon, primary, Ohayon, Yoel P., additional, Woloszyn, Karol, additional, Yang, Chu-fan, additional, Yoder, Jesse B., additional, Rothschild, Lynn J., additional, Wind, Shalom J., additional, Hendrickson, Wayne A., additional, Mao, Chengde, additional, Seeman, Nadrian C., additional, Canary, James W., additional, Sha, Ruojie, additional, and Vecchioni, Simon, additional

Published
2023
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6. Metal‐Mediated DNA Nanotechnology in 3D: Structural Library by Templated Diffraction

Author

Vecchioni, Simon, primary, Lu, Brandon, additional, Livernois, William, additional, Ohayon, Yoel P., additional, Yoder, Jesse B., additional, Yang, Chu‐Fan, additional, Woloszyn, Karol, additional, Bernfeld, William, additional, Anantram, M. P., additional, Canary, James W., additional, Hendrickson, Wayne A., additional, Rothschild, Lynn J., additional, Mao, Chengde, additional, Wind, Shalom J., additional, Seeman, Nadrian C., additional, and Sha, Ruojie, additional

Published
2023
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22. The Functional Response of Mesenchymal Stem Cells to Electron-Beam Patterned Elastomeric Surfaces Presenting Micrometer to Nanoscale Heterogeneous Rigidity

Author

Biggs, Manus J. P., primary, Fernandez, Marc, additional, Thomas, Dilip, additional, Cooper, Ryan, additional, Palma, Matteo, additional, Liao, Jinyu, additional, Fazio, Teresa, additional, Dahlberg, Carl, additional, Wheadon, Helen, additional, Pallipurath, Anuradha, additional, Pandit, Abhay, additional, Kysar, Jeffrey, additional, and Wind, Shalom J., additional

Published
2017
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31. Emerging many-body effects in semiconductor artificial graphene with low disorder.

Author

Lingjie Du, Sheng Wang, Scarabelli, Diego, Pfeiffer, Loren N., West, Ken W., Fallahi, Saeed, Gardner, Geoff C., Manfra, Michael J., Pellegrini, Vittorio, Wind, Shalom J., and Pinczuk, Aron

Abstract

The interplay between electron–electron interactions and the honeycomb topology is expected to produce exotic quantum phenomena and find applications in advanced devices. Semiconductor-based artificial graphene (AG) is an ideal system for these studies that combines high-mobility electron gases with AG topology. However, to date, low-disorder conditions that reveal the interplay of electron–electron interaction with AG symmetry have not been achieved. Here, we report the creation of low-disorder AG that preserves the near-perfection of the pristine electron layer by fabricating small period triangular antidot lattices on high-quality quantum wells. Resonant inelastic light scattering spectra show collective spin-exciton modes at the M-point's nearly flatband saddle-point singularity in the density of states. The observed Coulomb exchange interaction energies are comparable to the gap of Dirac bands at the M-point, demonstrating interplay between quasiparticle interactions and the AG potential. The saddle-point exciton energies are in the terahertz range, making low-disorder AG suitable for contemporary optoelectronic applications. [ABSTRACT FROM AUTHOR]

Published
2018
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36. Long-range charge transport in single G-quadruplex DNA molecules

Author

Livshits, Gideon I., primary, Stern, Avigail, additional, Rotem, Dvir, additional, Borovok, Natalia, additional, Eidelshtein, Gennady, additional, Migliore, Agostino, additional, Penzo, Erika, additional, Wind, Shalom J., additional, Di Felice, Rosa, additional, Skourtis, Spiros S., additional, Cuevas, Juan Carlos, additional, Gurevich, Leonid, additional, Kotlyar, Alexander B., additional, and Porath, Danny, additional

Published
2014
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40. Improved Glass Surface Passivation for Single-Molecule Nanoarrays.

Author

Haogang Cai and Wind, Shalom J.

Subjects
*GLASS, *SINGLE molecules, *NANOSTRUCTURED materials, *SURFACE chemistry, *FLUORESCENCE, *POLYETHYLENE glycol
Abstract

Single-molecule fluorescence techniques provide a critical tool for probing biomolecular and cellular interactions with unprecedented resolution and precision. Unfortunately, many of these techniques are hindered by a common problem, namely, the nonspecific adsorption of target biomolecules. This issue is mostly addressed by passivating the glass surfaces with a poly(ethylene glycol) (PEG) brush. This is effective only at low concentrations of the probe molecule because there are defects inherent to polymer brushes formed on glass coverslips due to the presence of surface impurities. Tween-20, a detergent, is a promising alternative that can improve surface passivation, but it is incompatible with living cells, and it also possesses limited selectivity for glass background over metallic nanoparticles, which are frequently used as anchors for the probe molecules. To address these issues, we have developed a more versatile method to improve the PEG passivation. A thin film of hydrogen silsesquioxane (HSQ) is spin-coated and thermally cured on glass coverslips in order to cover the surface impurities. This minimizes the formation of PEG defects and reduces nonspecific adsorption, resulting in an improvement comparable to Tween-20 treatment. This approach was applied to single-molecule nanoarrays of streptavidin bound to AuPd nanodots patterned by e-beam lithography (EBL). The fluorescence signal to background ratio (SBR) on HSQ-coated glass was improved by ∼4-fold as compared to PEG directly on glass. This improvement enables direct imaging of ordered arrays of single molecules anchored to lithographically patterned arrays of metallic nanodots. [ABSTRACT FROM AUTHOR]

Published
2016
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41. Observation of electron states of small period artificial graphene in nano-patterned GaAs quantum wells.

Author

Sheng Wang, Scarabelli, Diego, Kuznetsova, Yuliya Y., Wind, Shalom J., Pinczuk, Aron, Pellegrini, Vittorio, Manfra, Michael J., Gardner, Geoff C., Pfeiffer, Loren N., and West, Ken W.

Subjects
QUANTUM wells, GRAPHENE, HONEYCOMB structures, ELECTRONIC band structure, DOPING agents (Chemistry)
Abstract

Engineered honeycomb lattices, called artificial graphene (AG), are tunable platforms for the study of novel electronic states related to Dirac physics. In this work, we report the achievement of electronic bands of the honeycomb topology with the period as low as 40 nm on the nano-patterned modulation-doped AlGaAs/GaAs quantum wells. Resonant inelastic light scattering spectra reveal peaks which are interpreted as combined electronic transitions between subbands of the quantum well confinement with a change in the AG band index. Spectra lineshapes are explained by joint density of states obtained from the calculated AG electron band structures. These results provide a basis for further advancements in AG physics. [ABSTRACT FROM AUTHOR]

Published
2016
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