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.

*This work was supported the National Science Foundation CAREER Award NSF-1944498. Nanofabrication was conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network, Award Number NNCI -1542202.

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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