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Anomalous Dirac point transport due to extended defects in bilayer graphene

Charge transport at the Dirac point in bilayer graphene exhibits two dramatically different transport states, insulating and metallic, that occur in apparently otherwise indistinguishable experimental samples. We demonstrate that the existence of these two transport states has its origin in an inter...

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Autores principales: Shallcross, Sam, Sharma, Sangeeta, Weber, Heiko B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5571127/
https://www.ncbi.nlm.nih.gov/pubmed/28839136
http://dx.doi.org/10.1038/s41467-017-00397-8
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author Shallcross, Sam
Sharma, Sangeeta
Weber, Heiko B.
author_facet Shallcross, Sam
Sharma, Sangeeta
Weber, Heiko B.
author_sort Shallcross, Sam
collection PubMed
description Charge transport at the Dirac point in bilayer graphene exhibits two dramatically different transport states, insulating and metallic, that occur in apparently otherwise indistinguishable experimental samples. We demonstrate that the existence of these two transport states has its origin in an interplay between evanescent modes, that dominate charge transport near the Dirac point, and disordered configurations of extended defects in the form of partial dislocations. In a large ensemble of bilayer systems with randomly positioned partial dislocations, the distribution of conductivities is found to be strongly peaked at both the insulating and metallic limits. We argue that this distribution form, that occurs only at the Dirac point, lies at the heart of the observation of both metallic and insulating states in bilayer graphene.
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spelling pubmed-55711272017-08-30 Anomalous Dirac point transport due to extended defects in bilayer graphene Shallcross, Sam Sharma, Sangeeta Weber, Heiko B. Nat Commun Article Charge transport at the Dirac point in bilayer graphene exhibits two dramatically different transport states, insulating and metallic, that occur in apparently otherwise indistinguishable experimental samples. We demonstrate that the existence of these two transport states has its origin in an interplay between evanescent modes, that dominate charge transport near the Dirac point, and disordered configurations of extended defects in the form of partial dislocations. In a large ensemble of bilayer systems with randomly positioned partial dislocations, the distribution of conductivities is found to be strongly peaked at both the insulating and metallic limits. We argue that this distribution form, that occurs only at the Dirac point, lies at the heart of the observation of both metallic and insulating states in bilayer graphene. Nature Publishing Group UK 2017-08-24 /pmc/articles/PMC5571127/ /pubmed/28839136 http://dx.doi.org/10.1038/s41467-017-00397-8 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Shallcross, Sam
Sharma, Sangeeta
Weber, Heiko B.
Anomalous Dirac point transport due to extended defects in bilayer graphene
title Anomalous Dirac point transport due to extended defects in bilayer graphene
title_full Anomalous Dirac point transport due to extended defects in bilayer graphene
title_fullStr Anomalous Dirac point transport due to extended defects in bilayer graphene
title_full_unstemmed Anomalous Dirac point transport due to extended defects in bilayer graphene
title_short Anomalous Dirac point transport due to extended defects in bilayer graphene
title_sort anomalous dirac point transport due to extended defects in bilayer graphene
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5571127/
https://www.ncbi.nlm.nih.gov/pubmed/28839136
http://dx.doi.org/10.1038/s41467-017-00397-8
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