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Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene

Author

Listed:
  • Hongyun Zhang

    (Tsinghua University)

  • Qian Li

    (Tsinghua University)

  • Youngju Park

    (University of Seoul)

  • Yujin Jia

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Wanying Chen

    (Tsinghua University)

  • Jiaheng Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Qinxin Liu

    (Tsinghua University)

  • Changhua Bao

    (Tsinghua University)

  • Nicolas Leconte

    (University of Seoul)

  • Shaohua Zhou

    (Tsinghua University)

  • Yuan Wang

    (Tsinghua University)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Jose Avila

    (L’Orme des Merisiers)

  • Pavel Dudin

    (L’Orme des Merisiers)

  • Pu Yu

    (Tsinghua University
    Frontier Science Center for Quantum Information)

  • Hongming Weng

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Wenhui Duan

    (Tsinghua University
    Frontier Science Center for Quantum Information
    Tsinghua University)

  • Quansheng Wu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jeil Jung

    (University of Seoul
    University of Seoul)

  • Shuyun Zhou

    (Tsinghua University
    Frontier Science Center for Quantum Information)

Abstract

Twisted bilayer graphene (tBLG) provides a fascinating platform for engineering flat bands and inducing correlated phenomena. By designing the stacking architecture of graphene layers, twisted multilayer graphene can exhibit different symmetries with rich tunability. For example, in twisted monolayer-bilayer graphene (tMBG) which breaks the C2z symmetry, transport measurements reveal an asymmetric phase diagram under an out-of-plane electric field, exhibiting correlated insulating state and ferromagnetic state respectively when reversing the field direction. Revealing how the electronic structure evolves with electric field is critical for providing a better understanding of such asymmetric field-tunable properties. Here we report the experimental observation of field-tunable dichotomic electronic structure of tMBG by nanospot angle-resolved photoemission spectroscopy (NanoARPES) with operando gating. Interestingly, selective enhancement of the relative spectral weight contributions from monolayer and bilayer graphene is observed when switching the polarity of the bias voltage. Combining experimental results with theoretical calculations, the origin of such field-tunable electronic structure, resembling either tBLG or twisted double-bilayer graphene (tDBG), is attributed to the selectively enhanced contribution from different stacking graphene layers with a strong electron-hole asymmetry. Our work provides electronic structure insights for understanding the rich field-tunable physics of tMBG.

Suggested Citation

  • Hongyun Zhang & Qian Li & Youngju Park & Yujin Jia & Wanying Chen & Jiaheng Li & Qinxin Liu & Changhua Bao & Nicolas Leconte & Shaohua Zhou & Yuan Wang & Kenji Watanabe & Takashi Taniguchi & Jose Avil, 2024. "Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48166-8
    DOI: 10.1038/s41467-024-48166-8
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    References listed on IDEAS

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