Atomic Scale Relaxation at the van der Waals Interface in Twisted Bilayer Graphene

ORAL

Abstract

Adjusting stacking angle in two-dimensional van der Waals (vdW) atomic layers allows engineering physical properties of the heterostructures. Rotational lattice mismatch creates additional quasiperiodic structures described by moiré patterns, modifying the electronic band structures. More interestingly, the quasiperiodic moiré structures can be reconstructed into commensurate domain structures as a result of interplay between vdW interaction energy and elastic energy at the interface. The commensurate domains are topologically nontrivial in the presence of vertical displacement field, providing a network of one-dimensional transport modes along their boundaries. In this talk, we present transmission electron microscopy results to discuss the microstructures of twisted bilayer graphene. Electrical transport behavior with controlled vertical displacement field and carrier density was investigated to understand the effect of commensurate domains and their boundaries on the charge transport behavior.

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Presenters

  • Hyobin Yoo

    Physics, Harvard University, Harvard University

Authors

  • Hyobin Yoo

    Physics, Harvard University, Harvard University

  • Kuan Zhang

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

  • Rebecca Engelke

    Physics, Harvard University

  • 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