Moiré effects in twisted graphene/graphite heterostructures

ORAL

Abstract

Moiré vdW heterostructures often host flat and isolated electronic bands which lead to strongly correlated states including superconductivity and magnetism. Ultra-thin twisted graphene heterostructures assembled from monolayer and bilayer constituents have been studied extensively over the past few years, but it is unknown what types of moiré effects emerge in the limit of bulk graphite (≥10 layers). We perform transport measurements of dual gated twisted monolayer graphene-graphite devices and find that the resulting two-dimensional surface moiré potential fundamentally changes the electronic properties of the entire structure. At low magnetic fields, we observe a single resistive peak that moves in an unusual zig-zag trajectory as a function of the top and bottom gate voltages. We observe a similar zig-zag evolution of quantum oscillations emerging at higher fields, which differ substantially depending on which gate is tuned. These measurements indicate that doping of the entire bulk graphite oscillates periodically as the moiré surface bands are filled. The unique properties of these moiré/bulk hybrid structures derive from the semimetallic nature of graphite, establishing a new class of moiré materials with mixed dimensionality.

*This work is supported by the National Science Foundation through DGE-2140004

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Presenters

  • Ellis Thompson

    • University of Washington

Authors

  • Ellis Thompson

    • University of Washington

  • Dacen Waters

    • University of Washington

  • Esmeralda Arreguin-Martinez

    • University of Washington
    • University Of Washington

  • Manato Fujimoto

    • Osaka Univ

  • Yafei Ren

    • University of Washington

  • 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

  • Ting Cao

    • University of Washington
    • Department of Materials Science & Engineering, University of Washington

  • Di Xiao

    • University of Washington
    • 1. Department of Materials Science & Engineering, University of Washington, Seattle WA 98915 2. Department of Physics, University of Washington, Seattle WA 98915
    • Department of Materials Science & Engineering, Department of Physics, University of Washington; Pacific Northwest National Laboratory

  • Matthew A Yankowitz

    • University of Washington