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Giant ferroelectric polarization in a bilayer graphene heterostructure

Author

Listed:
  • Ruirui Niu

    (Peking University)

  • Zhuoxian Li

    (Peking University)

  • Xiangyan Han

    (Peking University)

  • Zhuangzhuang Qu

    (Peking University)

  • Dongdong Ding

    (Peking University)

  • Zhiyu Wang

    (Peking University)

  • Qianling Liu

    (Peking University)

  • Tianyao Liu

    (Peking University)

  • Chunrui Han

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

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Menghao Wu

    (Huazhong University of Science and Technology)

  • Qi Ren

    (Beijing Institute of Technology)

  • Xueyun Wang

    (Beijing Institute of Technology)

  • Jiawang Hong

    (Beijing Institute of Technology)

  • Jinhai Mao

    (University of Chinese Academy of Sciences)

  • Zheng Han

    (Shanxi University
    Shanxi University)

  • Kaihui Liu

    (Peking University)

  • Zizhao Gan

    (Peking University)

  • Jianming Lu

    (Peking University)

Abstract

At the interface of van der Waals heterostructures, the crystal symmetry and the electronic structure can be reconstructed, giving rise to physical properties superior to or absent in parent materials. Here by studying a Bernal bilayer graphene moiré superlattice encapsulated by 30°-twisted boron nitride flakes, we report an unprecedented ferroelectric polarization with the areal charge density up to 1013 cm−2, which is far beyond the capacity of a moiré band. The translated polarization ~5 pC m−1 is among the highest interfacial ferroelectrics engineered by artificially stacking van der Waals crystals. The gate-specific ferroelectricity and co-occurring anomalous screening are further visualized via Landau levels, and remain robust for Fermi surfaces outside moiré bands, confirming their independence on correlated electrons. We also find that the gate-specific resistance hysteresis loops could be turned off by the other gate, providing an additional control knob. Furthermore, the ferroelectric switching can be applied to intrinsic properties such as topological valley current. Overall, the gate-specific ferroelectricity with strongly enhanced charge polarization may encourage more explorations to optimize and enrich this novel class of ferroelectricity, and promote device applications for ferroelectric switching of various quantum phenomena.

Suggested Citation

  • Ruirui Niu & Zhuoxian Li & Xiangyan Han & Zhuangzhuang Qu & Dongdong Ding & Zhiyu Wang & Qianling Liu & Tianyao Liu & Chunrui Han & Kenji Watanabe & Takashi Taniguchi & Menghao Wu & Qi Ren & Xueyun Wa, 2022. "Giant ferroelectric polarization in a bilayer graphene heterostructure," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34104-z
    DOI: 10.1038/s41467-022-34104-z
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    References listed on IDEAS

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    1. Shuai Zhang & Yang Liu & Zhiyuan Sun & Xinzhong Chen & Baichang Li & S. L. Moore & Song Liu & Zhiying Wang & S. E. Rossi & Ran Jing & Jordan Fonseca & Birui Yang & Yinming Shao & Chun-Ying Huang & Tak, 2023. "Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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