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Unconventional correlated insulator in CrOCl-interfaced Bernal bilayer graphene

Author

Listed:
  • Kaining Yang

    (Shanxi University
    Shanxi University)

  • Xiang Gao

    (Shanxi University
    Shanxi University)

  • Yaning Wang

    (Institute of Metal Research, Chinese Academy of Sciences
    University of Science and Technology of China)

  • Tongyao Zhang

    (Shanxi University
    Shanxi University)

  • Yuchen Gao

    (Collaborative Innovation Center of Quantum Matter
    Peking University)

  • Xin Lu

    (ShanghaiTech University)

  • Shihao Zhang

    (ShanghaiTech University)

  • Jianpeng Liu

    (ShanghaiTech University
    ShanghaiTech University)

  • Pingfan Gu

    (Collaborative Innovation Center of Quantum Matter
    Peking University)

  • Zhaoping Luo

    (Institute of Metal Research, Chinese Academy of Sciences)

  • Runjie Zheng

    (Peking University)

  • Shimin Cao

    (Peking University
    Beijing Academy of Quantum Information Sciences)

  • Hanwen Wang

    (Institute of Metal Research, Chinese Academy of Sciences)

  • Xingdan Sun

    (Institute of Metal Research, Chinese Academy of Sciences)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Xiuyan Li

    (Institute of Metal Research, Chinese Academy of Sciences)

  • Jing Zhang

    (Shanxi University
    Shanxi University)

  • Xi Dai

    (University of California
    The Hongkong University of Science and Technology)

  • Jian-Hao Chen

    (Peking University
    Beijing Academy of Quantum Information Sciences
    Peking University
    Hefei National Laboratory)

  • Yu Ye

    (Collaborative Innovation Center of Quantum Matter
    Peking University)

  • Zheng Han

    (Shanxi University
    Shanxi University
    Liaoning Academy of Materials)

Abstract

The realization of graphene gapped states with large on/off ratios over wide doping ranges remains challenging. Here, we investigate heterostructures based on Bernal-stacked bilayer graphene (BLG) atop few-layered CrOCl, exhibiting an over-1-GΩ-resistance insulating state in a widely accessible gate voltage range. The insulating state could be switched into a metallic state with an on/off ratio up to 107 by applying an in-plane electric field, heating, or gating. We tentatively associate the observed behavior to the formation of a surface state in CrOCl under vertical electric fields, promoting electron–electron (e–e) interactions in BLG via long-range Coulomb coupling. Consequently, at the charge neutrality point, a crossover from single particle insulating behavior to an unconventional correlated insulator is enabled, below an onset temperature. We demonstrate the application of the insulating state for the realization of a logic inverter operating at low temperatures. Our findings pave the way for future engineering of quantum electronic states based on interfacial charge coupling.

Suggested Citation

  • Kaining Yang & Xiang Gao & Yaning Wang & Tongyao Zhang & Yuchen Gao & Xin Lu & Shihao Zhang & Jianpeng Liu & Pingfan Gu & Zhaoping Luo & Runjie Zheng & Shimin Cao & Hanwen Wang & Xingdan Sun & Kenji W, 2023. "Unconventional correlated insulator in CrOCl-interfaced Bernal bilayer graphene," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37769-2
    DOI: 10.1038/s41467-023-37769-2
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    References listed on IDEAS

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    1. M. J. Zhu & A. V. Kretinin & M. D. Thompson & D. A. Bandurin & S. Hu & G. L. Yu & J. Birkbeck & A. Mishchenko & I. J. Vera-Marun & K. Watanabe & T. Taniguchi & M. Polini & J. R. Prance & K. S. Novosel, 2017. "Edge currents shunt the insulating bulk in gapped graphene," Nature Communications, Nature, vol. 8(1), pages 1-6, April.
    2. Pedro Brussarski & S. Li & S. V. Kravchenko & A. A. Shashkin & M. P. Sarachik, 2018. "Transport evidence for a sliding two-dimensional quantum electron solid," Nature Communications, Nature, vol. 9(1), pages 1-5, December.
    3. Yuanbo Zhang & Tsung-Ta Tang & Caglar Girit & Zhao Hao & Michael C. Martin & Alex Zettl & Michael F. Crommie & Y. Ron Shen & Feng Wang, 2009. "Direct observation of a widely tunable bandgap in bilayer graphene," Nature, Nature, vol. 459(7248), pages 820-823, June.
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    Cited by:

    1. Pingfan Gu & Cong Wang & Dan Su & Zehao Dong & Qiuyuan Wang & Zheng Han & Kenji Watanabe & Takashi Taniguchi & Wei Ji & Young Sun & Yu Ye, 2023. "Multi-state data storage in a two-dimensional stripy antiferromagnet implemented by magnetoelectric effect," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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