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Insulating to relativistic quantum Hall transition in disordered graphene
Quasi-particle excitations in graphene exhibit a unique behavior concerning two key phenomena of mesoscopic physics: electron localization and the quantum Hall effect. A direct transition between these two states has been found in disordered two-dimensional electron gases at low magnetic field. It h...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3646355/ http://dx.doi.org/10.1038/srep01791 |
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author | Pallecchi, E. Ridene, M. Kazazis, D. Lafont, F. Schopfer, F. Poirier, W. Goerbig, M. O. Mailly, D. Ouerghi, A. |
author_facet | Pallecchi, E. Ridene, M. Kazazis, D. Lafont, F. Schopfer, F. Poirier, W. Goerbig, M. O. Mailly, D. Ouerghi, A. |
author_sort | Pallecchi, E. |
collection | PubMed |
description | Quasi-particle excitations in graphene exhibit a unique behavior concerning two key phenomena of mesoscopic physics: electron localization and the quantum Hall effect. A direct transition between these two states has been found in disordered two-dimensional electron gases at low magnetic field. It has been suggested that it is a quantum phase transition, but the nature of the transition is still debated. Despite the large number of works studying either the localization or the quantum Hall regime in graphene, such a transition has not been investigated for Dirac fermions. Here we discuss measurements on low-mobility graphene where the localized state at low magnetic fields and a quantum Hall state at higher fields are observed. We find that the system undergoes a direct transition from the insulating to the Hall conductor regime. Remarkably, the transverse magneto-conductance shows a temperature independent crossing point, pointing to the existence of a genuine quantum phase transition. |
format | Online Article Text |
id | pubmed-3646355 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-36463552013-05-13 Insulating to relativistic quantum Hall transition in disordered graphene Pallecchi, E. Ridene, M. Kazazis, D. Lafont, F. Schopfer, F. Poirier, W. Goerbig, M. O. Mailly, D. Ouerghi, A. Sci Rep Article Quasi-particle excitations in graphene exhibit a unique behavior concerning two key phenomena of mesoscopic physics: electron localization and the quantum Hall effect. A direct transition between these two states has been found in disordered two-dimensional electron gases at low magnetic field. It has been suggested that it is a quantum phase transition, but the nature of the transition is still debated. Despite the large number of works studying either the localization or the quantum Hall regime in graphene, such a transition has not been investigated for Dirac fermions. Here we discuss measurements on low-mobility graphene where the localized state at low magnetic fields and a quantum Hall state at higher fields are observed. We find that the system undergoes a direct transition from the insulating to the Hall conductor regime. Remarkably, the transverse magneto-conductance shows a temperature independent crossing point, pointing to the existence of a genuine quantum phase transition. Nature Publishing Group 2013-05-07 /pmc/articles/PMC3646355/ http://dx.doi.org/10.1038/srep01791 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/ |
spellingShingle | Article Pallecchi, E. Ridene, M. Kazazis, D. Lafont, F. Schopfer, F. Poirier, W. Goerbig, M. O. Mailly, D. Ouerghi, A. Insulating to relativistic quantum Hall transition in disordered graphene |
title | Insulating to relativistic quantum Hall transition in disordered graphene |
title_full | Insulating to relativistic quantum Hall transition in disordered graphene |
title_fullStr | Insulating to relativistic quantum Hall transition in disordered graphene |
title_full_unstemmed | Insulating to relativistic quantum Hall transition in disordered graphene |
title_short | Insulating to relativistic quantum Hall transition in disordered graphene |
title_sort | insulating to relativistic quantum hall transition in disordered graphene |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3646355/ http://dx.doi.org/10.1038/srep01791 |
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