Unconventional fractional quantum Hall effect in bilayer graphene

Unconventional fractional quantum Hall effect in bilayer graphene

Abstract Recent experimental progress in Hall measurements in bilayer graphene in the so-called open-face configuration of boron nitride encapsulated samples, together with the earlier technique of suspended samples, allows for precise observation of the fractional quantum Hall effect (FQHE) in all...

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Autor principal: Janusz Edward Jacak
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
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Acceso en línea:https://doaj.org/article/f1dafa82571f4fda90737a2a7c19a2ef
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spelling oai:doaj.org-article:f1dafa82571f4fda90737a2a7c19a2ef2021-12-02T15:05:19ZUnconventional fractional quantum Hall effect in bilayer graphene10.1038/s41598-017-09166-52045-2322https://doaj.org/article/f1dafa82571f4fda90737a2a7c19a2ef2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-09166-5https://doaj.org/toc/2045-2322Abstract Recent experimental progress in Hall measurements in bilayer graphene in the so-called open-face configuration of boron nitride encapsulated samples, together with the earlier technique of suspended samples, allows for precise observation of the fractional quantum Hall effect (FQHE) in all 4 subbands of the Lowest Landau level (with n = 0 and n = 1) and in the next LL subbands (with n = 2) in the bilayer system. Many newly observed FQHE features do not agree with a conventional model of composite fermions and reveal a different hierarchy in comparison to monolayer graphene or GaAs 2DEG. We explain the peculiarity of the FQHE hierarchy in the bilayer system in the framework of a topological approach, which includes the composite fermion model as its special case. Inclusion of a topological effect caused by the hopping of electrons between the two sheets in the bilayer system allowed for an explanation of the FQHE hierarchy in the graphene bilayer in satisfactory accordance with the experimental observations.Janusz Edward JacakNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-13 (2017)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Janusz Edward Jacak
Unconventional fractional quantum Hall effect in bilayer graphene
description Abstract Recent experimental progress in Hall measurements in bilayer graphene in the so-called open-face configuration of boron nitride encapsulated samples, together with the earlier technique of suspended samples, allows for precise observation of the fractional quantum Hall effect (FQHE) in all 4 subbands of the Lowest Landau level (with n = 0 and n = 1) and in the next LL subbands (with n = 2) in the bilayer system. Many newly observed FQHE features do not agree with a conventional model of composite fermions and reveal a different hierarchy in comparison to monolayer graphene or GaAs 2DEG. We explain the peculiarity of the FQHE hierarchy in the bilayer system in the framework of a topological approach, which includes the composite fermion model as its special case. Inclusion of a topological effect caused by the hopping of electrons between the two sheets in the bilayer system allowed for an explanation of the FQHE hierarchy in the graphene bilayer in satisfactory accordance with the experimental observations.
format article
author Janusz Edward Jacak
author_facet Janusz Edward Jacak
author_sort Janusz Edward Jacak
title Unconventional fractional quantum Hall effect in bilayer graphene
title_short Unconventional fractional quantum Hall effect in bilayer graphene
title_full Unconventional fractional quantum Hall effect in bilayer graphene
title_fullStr Unconventional fractional quantum Hall effect in bilayer graphene
title_full_unstemmed Unconventional fractional quantum Hall effect in bilayer graphene
title_sort unconventional fractional quantum hall effect in bilayer graphene
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/f1dafa82571f4fda90737a2a7c19a2ef
work_keys_str_mv AT januszedwardjacak unconventionalfractionalquantumhalleffectinbilayergraphene
_version_ 1718388867191537664

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