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Tunneling Spectroscopy of Quantum Hall States via a Dual-gated Graphene Quantum Point Contact

ORAL

Abstract

We study low-temperature magneto-transport across a dual-gated graphene point contact. We demonstrate selective control over the evolution, hybridization, and transmission of quantum Hall states in the channel. By tuning the coupling between quantum Hall edge states, we characterize their energy gap via tunneling spectroscopy.

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Presenters

  • Xi Zhang

    University of Minnesota

Authors

  • Xi Zhang

    University of Minnesota

  • Wei Ren

    University of Minnesota

  • Jaden Ma

    University of Minnesota

  • Xihe Han

    University of Wisconsin

  • Kenji Watanabe

    National Institute for Materials Science, Research Center for Functional Materials, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, NIMS, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Takashi Taniguchi

    National Institute for Materials Science, Kyoto Univ, International Center for Materials Nanoarchitectonics, National Institute of Materials Science, Kyoto University, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Science, Japan, National Institute For Materials Science, NIMS, National Institute for Material Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan

  • Ke Wang

    University of Minnesota