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STM characterization of super-moire relaxation in helical trilayer graphene

ORAL

Abstract

Magic-angle helical trilayer graphene (HTG) is a novel graphene-based moiré system due to its predicted super-moiré reconstruction and possible exotic correlated and topological electronic phases such as integer and fractional Chern insulator states. The super-moiré reconstruction of HTG is predicted to relax into large triangular domains with different Chern numbers, thus leading to gapless chiral edge modes at the domain walls. Using scanning tunneling microscopy and spectroscopy (STM/S), we have characterized the super-moire pattern in magic-angle HTG devices with high resolution. We have additionally investigated the spectroscopic features of moiré quasicrystals that arise in these gate-tunable trilayer systems for non-equal twist angles between the layers.

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Presenters

  • Dhanvanth Balakrishnan

    University of California, Berkeley

Authors

  • Dhanvanth Balakrishnan

    University of California, Berkeley

  • Aining Hu

    University of California, Berkeley

  • Yi-Fan Zhao

    University of California, Berkeley

  • Emma Berger

    University of California, Berkeley

  • Lucas Schneider

    University of California, Berkeley

  • Michael Arumainayagam

    University of California, Berkeley

  • John C Thomas

    Lawrence Berkeley National Laboratory

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, Research Center for Functional Materials, National Institute for Materials Science, Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National Institute of Material Science, Tsukuba, Japan, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science

  • Takashi Taniguchi

    National Institute for Materials Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan, Advanced Materials Laboratory, National Institute for Materials Science

  • Alex K Zettl

    University of California, Berkeley

  • feng wang

    University of California, Berkeley

  • Alexander Weber-Bargioni

    Lawrence Berkeley National Laboratory

  • Michael F Crommie

    University of California, Berkeley