Progress towards probing quantum Hall edge states in Graphene Heterostructures

ORAL

Abstract

Capacitance measurements reveal graphite gated, hexagonal boron nitride encapsulated graphene to be an extremely clean two dimensional electron system. In these devices, well-developed incompressible fractional quantum Hall peaks are evident down to magnetic fields as small as 1 Tesla, with a variety of even denominator fractional quantum hall states appearing at high magnetic fields. However, these states appear less accessible in multiterminal transport measurements due to fringe field effects, etch-induced edge disorder, contact resistances and other unknown issues. This makes mesoscopic physics experiments that rely on edge properties--such as edge state interferometry--an experimental challenge. I will give a progress report on our efforts to probe edge states with transport measurements, including efforts to engineer all-electrostatically defined devices.

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Presenters

  • Haoxin Zhou

    University of California - Santa Barbara, Physics Department, University of California, Univ of California - Santa Barbara

Authors

  • Haoxin Zhou

    University of California - Santa Barbara, Physics Department, University of California, Univ of California - Santa Barbara

  • Alexander Zibrov

    University of California - Santa Barbara, Department of Physics, University of California, Santa Barbara, Physics Department, University of California, Univ of California - Santa Barbara

  • Eric Spanton

    University of California - Santa Barbara, Stanford Univ, California Nanosystems Institute, University of California, Santa Barbara, California Nanosystems Institute, University of California, Univ of California - Santa Barbara

  • Takashi Taniguchi

    National Institute for Materials Science, NIMS, National Institute for Material Science, Advanced Materials Laboratory, National Institute for Materials Science, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science (NIMS, Advanced Materials Laboratory, NIMS, National Institute for Materials Science, Advanced Materials Laboratory, National Institue for Materials Science, National Institute of Material Science, National Institute for Matericals Science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, NIMS-Japan

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, National Institute for Material Science, Advanced Materials Laboratory, National Institute for Materials Science, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science (NIMS, Advanced Materials Laboratory, NIMS, National Institute for Materials Science, Advanced Materials Laboratory, National Institue for Materials Science, National Institute of Material Science, National Institute for Matericals Science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Advanced materials laboratory, National institute for Materials Science, NIMS-Japan

  • Andrea Young

    Physics, University of California Santa Barbara, Physics, Univ of California - Santa Barbara, University of California - Santa Barbara, Univ of California - Santa Barbara, Department of Physics, University of California, Santa Barbara, Physics Department, University of California