Flat band in twisted graphene I: Evolution of flat band near the Magic Angle in twisted bilayer graphene

ORAL

Abstract

Magic-angle twisted bilayer graphene (MATBG) exhibits intriguing correlated phenomena, whose central physics is related to the flat band near the Fermi energy. Such flat band not only depends on the moiré period, but is also expected to be sensitively affected by lattice relaxations, which has remained elusive so far due to the lack of a systematic evolution of energy- and momentum-resolved electronic structure with the twist angle. To figure out the important role of lattice relaxion in MATBG, we combine NanoARPES, AFM measurements and theoretical calculations to reveal the evolution of band structure near magic angle. Our results not only provide direct spectroscopic information for understanding the flat band physics, but also highlight the critical role of lattice relaxations in the electronic structure of twisted bilayer graphene.

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Presenters

  • Qian Li

    Tsinghua University

Authors

  • Qian Li

    Tsinghua University

  • Hongyun Zhang

    Tsinghua University

  • Yijie Wang

    Peking university, Peking University

  • Wanying Chen

    Tsinghua university, Tsinghua University

  • Changhua Bao

    Tsinghua university, Department of Physics, Tsinghua University

  • Tianyun Lin

    Tsinghua University

  • Shuai Zhang

    Tsinghua University

  • Haoxiong Zhang

    Tsinghua University

  • Kenji Watanabe

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

  • Takashi Taniguchi

    Kyoto Univ, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Sciences, NIMS, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, International Center for Materials Nanoarchitectonics, NIMS, Japan, International Center for Materials Nanoarchitectonics, Tsukuba, National Institue for Materials Science, Kyoto University, National Institute of Materials Science, International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Jose Avila

    Synchrotron SOLEIL and Universite Paris-Sacley, Synchrotron SOLEIL

  • Pavel Dudin

    Synchrotron SOLEIL

  • Qunyang Li

    Tsinghua University

  • Pu Yu

    Tsinghua University, Tsinghua university

  • Wenhui Duan

    Tsinghua University

  • Zhida Song

    Peking university, Peking University, Peking Univ, Princeton University

  • Shuyun Zhou

    Tsinghua university, Tsinghua University