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Helical edge states and fractional quantum Hall effect in a graphene electron-hole bilayer

Helical 1D electronic systems are a promising route towards realizing circuits of topological quantum states that exhibit non-Abelian statistics. Here, we demonstrate a versatile platform to realize 1D systems made by combining quantum Hall (QH) edge states of opposite chiralities in a graphene elec... Full description

Journal Title: Nature Nanotechnology Feb 2017, Vol.12(2), pp.118-122
Main Author: Sanchez-Yamagishi, Javier
Other Authors: Luo, Jason , Young, Andrea , Hunt, Benjamin , Watanabe, Kenji , Taniguchi, Takashi , Ashoori, Raymond , Jarillo-Herrero, Pablo
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 17483387 ; DOI: 10.1038/nnano.2016.214
Link: http://search.proquest.com/docview/1865513836/?pq-origsite=primo
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title: Helical edge states and fractional quantum Hall effect in a graphene electron-hole bilayer
format: Article
creator:
  • Sanchez-Yamagishi, Javier
  • Luo, Jason
  • Young, Andrea
  • Hunt, Benjamin
  • Watanabe, Kenji
  • Taniguchi, Takashi
  • Ashoori, Raymond
  • Jarillo-Herrero, Pablo
subjects:
  • Engineering
ispartof: Nature Nanotechnology, Feb 2017, Vol.12(2), pp.118-122
description: Helical 1D electronic systems are a promising route towards realizing circuits of topological quantum states that exhibit non-Abelian statistics. Here, we demonstrate a versatile platform to realize 1D systems made by combining quantum Hall (QH) edge states of opposite chiralities in a graphene electron-hole bilayer at moderate magnetic fields. Using this approach, we engineer helical 1D edge conductors where the counterpropagating modes are localized in separate electron and hole layers by a tunable electric field. These helical conductors exhibit strong non-local transport signals and suppressed backscattering due to the opposite spin polarizations of the counterpropagating modes. Unlike other approaches used for realizing helical states, the graphene electron-hole bilayer can be used to build new 1D systems incorporating fractional edge states. Indeed, we are able to tune the bilayer devices into a regime hosting fractional and integer edge states of opposite chiralities, paving the way towards 1D helical conductors with fractional quantum statistics.
language: eng
source:
identifier: ISSN: 17483387 ; DOI: 10.1038/nnano.2016.214
fulltext: fulltext
issn:
  • 17483387
  • 1748-3387
url: Link


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identifierISSN: 17483387 ; DOI: 10.1038/nnano.2016.214
descriptionHelical 1D electronic systems are a promising route towards realizing circuits of topological quantum states that exhibit non-Abelian statistics. Here, we demonstrate a versatile platform to realize 1D systems made by combining quantum Hall (QH) edge states of opposite chiralities in a graphene electron-hole bilayer at moderate magnetic fields. Using this approach, we engineer helical 1D edge conductors where the counterpropagating modes are localized in separate electron and hole layers by a tunable electric field. These helical conductors exhibit strong non-local transport signals and suppressed backscattering due to the opposite spin polarizations of the counterpropagating modes. Unlike other approaches used for realizing helical states, the graphene electron-hole bilayer can be used to build new 1D systems incorporating fractional edge states. Indeed, we are able to tune the bilayer devices into a regime hosting fractional and integer edge states of opposite chiralities, paving the way towards 1D helical conductors with fractional quantum statistics.
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titleHelical edge states and fractional quantum Hall effect in a graphene electron-hole bilayer
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abstractHelical 1D electronic systems are a promising route towards realizing circuits of topological quantum states that exhibit non-Abelian statistics. Here, we demonstrate a versatile platform to realize 1D systems made by combining quantum Hall (QH) edge states of opposite chiralities in a graphene electron-hole bilayer at moderate magnetic fields. Using this approach, we engineer helical 1D edge conductors where the counterpropagating modes are localized in separate electron and hole layers by a tunable electric field. These helical conductors exhibit strong non-local transport signals and suppressed backscattering due to the opposite spin polarizations of the counterpropagating modes. Unlike other approaches used for realizing helical states, the graphene electron-hole bilayer can be used to build new 1D systems incorporating fractional edge states. Indeed, we are able to tune the bilayer devices into a regime hosting fractional and integer edge states of opposite chiralities, paving the way towards 1D helical conductors with fractional quantum statistics.
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doi10.1038/nnano.2016.214
urlhttp://search.proquest.com/docview/1865513836/
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date2017-02-01