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