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Imaging topological and correlated insulating states in twisted monolayer-bilayer graphene

Author

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  • Si-yu Li

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

  • Zhengwen Wang

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

  • Yucheng Xue

    (University of Chinese Academy of Sciences)

  • Yingbo Wang

    (University of Chinese Academy of Sciences)

  • Shihao Zhang

    (ShanghaiTech University)

  • Jianpeng Liu

    (ShanghaiTech University)

  • Zheng Zhu

    (University of Chinese Academy of Sciences)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Hong-jun Gao

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

  • Yuhang Jiang

    (University of Chinese Academy of Sciences)

  • Jinhai Mao

    (University of Chinese Academy of Sciences)

Abstract

Flat bands in Van der Waals heterostructure provide an ideal platform for unveiling emergent quantum electronic phases. One celebrated example is twisted monolayer-bilayer graphene, in which the effects of electronic correlation have been observed. Here, we report the observation via scanning tunnelling microscopy and spectroscopy of correlated insulating states in twisted monolayer-bilayer graphene, leading to the formation of an electron crystal phase. At integer fillings, the strong Coulomb interaction redistributes flat-band electrons within one moiré unit cell, producing an insulating state with vanishing density of states at the Fermi level. Moreover, our approach enables the direct visualization of an ordered lattice of topological torus-shaped states, generated by the interaction between the electron crystal and the non-trivial band topology of twisted monolayer-bilayer graphene. Our results illustrate an efficient strategy for entwining topological physics with strong electron correlation in twisted van der Waals structures.

Suggested Citation

  • Si-yu Li & Zhengwen Wang & Yucheng Xue & Yingbo Wang & Shihao Zhang & Jianpeng Liu & Zheng Zhu & Kenji Watanabe & Takashi Taniguchi & Hong-jun Gao & Yuhang Jiang & Jinhai Mao, 2022. "Imaging topological and correlated insulating states in twisted monolayer-bilayer graphene," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31851-x
    DOI: 10.1038/s41467-022-31851-x
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    1. 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.

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