Structural study of atomic relaxation and commensurate transition in twisted bilayer graphene

ORAL

Abstract

At small twist angles, artificially stacked bilayer graphene is known to relax into a structure of periodic, commensurate domains with discommensurate domain walls, providing the material with a superlattice potential and a network of topologically-protected conduction paths. Dark-field transmission electron microscopy has been used to visualize these domains and make inferences about the structure. We supplement this information with quantitative analysis of electron diffraction patterns in comparison with simulations, to gain new insight into the details of the commensurate structure and its twist-angle dependence.

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Presenters

  • Rebecca Engelke

    Physics, Harvard University

Authors

  • Rebecca Engelke

    Physics, Harvard University

  • Hyobin Yoo

    Physics, Harvard University, Harvard University

  • Kuan Zhang

    University of Minnesota, Aerospace Engineering and Mechanics, University of Minnesota

  • Paul Cazeaux

    University of Minnesota, Applied Mathematics, University of Kansas

  • Suk Hyun Sung

    University of Michigan, Materials Science and Engineering, University of Michigan

  • Robert Hovden

    University of Michigan, Materials Science and Engineering, University of Michigan, Materials Science & Engineering, University of Michigan

  • Adam Tsen

    University of Waterloo, Chemistry, University of Waterloo, Univ of Waterloo, IQC, Univ of Waterloo

  • 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

  • Gyu-Chul Yi

    Physics and Astronomy, Seoul National University, Seoul National University, Department of Physics and Astronomy, Seoul National University

  • Miyoung Kim

    Materials Science and Engineering, Seoul National University, Seoul National University, Department of Material Science and Engineering, Seoul National University

  • Mitchell Luskin

    University of Minnesota, School of Mathematics, University of Minnesota

  • Ellad Tadmor

    University of Minnesota, Aerospace Engineering and Mechanics, University of Minnesota

  • Philip Kim

    Department of Physics, Harvard University, Physics, Harvard University