Patterned Dielectric Superlattices on van der Waals 2D Materials

ORAL

Abstract

Patterned Dielectric Superlattices provide a powerful route towards modifying electron bands in 2D materials through external electric fields. We pattern dielectric layers in our devices using e-beam lithography to achieve lattice wavelengths as small as 35nm while maintaining high device mobility. Using this technique, we have realized clear Brillouin zone folding in graphene on boron nitride systems as well as fully developed Hofstadter fractal quantization of unmatched quality in any system with a fabricated superlattice. We present transport data from graphene systems under both triangular and square superlattice potentials, which exhibit fractal spectra under magnetic field unique to those specific lattice geometries. Additionally, we can tune the superlattice potential strength by varying relevant gating voltages, and even turn off the superlattice altogether. We further present our efforts in extending PDSLs to a wider variety of van der Waals materials and measurement techniques.

*This work was supported by the National Science Foundation (DMR-1462383). C.F. was supported by NSF GRFP (DGE-14-44869) and NSF IGERT (DGE-1069240).

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Presenters

  • Carlos Forsythe

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

Authors

  • Carlos Forsythe

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

  • Xiaodong Zhou

    • Columbia University
    • Laboratory of Advanced Materials, Fudan University

  • 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

  • Abhay Pasupathy

    • Columbia University
    • Columbia Univ
    • Physics, Columbia Univ
    • Department of Physics, Columbia university

  • Pilkyung Moon

    • NYU Shanghai
    • Arts and Sciences, New York University, Shanghai

  • Mikito Koshino

    • Osaka University
    • Department of Physics, Osaka University

  • Philip Kim

    • Physics, Harvard University
    • Harvard University
    • Department of Physics, Harvard University
    • Harvard Univ
    • Physics, Harvard
    • Department of Physics, Harvard university
    • School of Applied Sciences and Engineering, Harvard 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