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

  • Author(s): Sanchez-Yamagishi, Javier D
  • Luo, Jason Y
  • Young, Andrea F
  • Hunt, Benjamin M
  • Watanabe, Kenji
  • Taniguchi, Takashi
  • Ashoori, Raymond C
  • Jarillo-Herrero, Pablo
  • et al.

Published Web Location

https://arxiv.org/abs/1602.06815
No data is associated with this publication.
Abstract

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.

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