Anisotropic transport in graphene via 1D patterned dielectric superlattices

ORAL

Abstract

Band structure engineering of two-dimensional materials entered the spotlight with the experimental discovery of Hofstadter's butterfly in graphene on hexagonal boron nitride. Recently it became possible to fabricate device structures with features beyond the limitations imposed by the naturally occurring moiré pattern through the use of patterned dielectric superlattices (PDSLs). In these devices, the dielectric between the back gate and the graphene is periodically structured to create a modulated carrier density on the order of tens of nanometers. We report the fabrication and measurement of 1D PDSLs that produce highly anisotropic transport in monolayer graphene. Resistivity measured perpendicular to the 1D superlattice shows the standard Dirac peak while resistivity measured parallel to the 1D superlattice demonstrates additional satellite peaks. Additionally, we observe Weiss oscillations when the cyclotron orbit of carriers is commensurate with the superlattice wavelength. These observations mark a crucial step for the in-situ tunable modification of graphene’s band structure in a highly anisotropic fashion that has applications in ballistic electron optics, van der Waals FETs, and plasmonics.

*This work is supported by the Semiconductor Research Corporation (INDEX).

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Presenters

  • Scott Dietrich

    • Columbia University

Authors

  • Scott Dietrich

    • Columbia University

  • Carlos Forsythe

    • Columbia University
    • Physics, Columbia University
    • Department of Physics, Columbia University

  • Shaowen Chen

    • Columbia University
    • Columbia Univ

  • 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

  • James Hone

    • Columbia University
    • Columbia Univ
    • Mechanical Engineering, Columbia Univ.
    • Mechanical Engineering, Columbia University
    • Physics, Columbia Univ
    • Department of Mechanical Engineering, Columbia University

  • Cory Dean

    • Physics, Columbia University
    • Columbia University
    • Columbia Univ
    • Physics, Columbia Univ
    • physics, columbia university in the city of new york
    • Department of Physics, Columbia University