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Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures

Author

Listed:
  • Xin Lu

    (ShanghaiTech University)

  • Shihao Zhang

    (ShanghaiTech University)

  • Yaning Wang

    (Chinese Academy of Sciences)

  • Xiang Gao

    (Shanxi University
    Shanxi University)

  • Kaining Yang

    (Shanxi University
    Shanxi University)

  • Zhongqing Guo

    (ShanghaiTech University)

  • Yuchen Gao

    (Collaborative Innovation Center of Quantum Matter
    Peking University)

  • Yu Ye

    (Collaborative Innovation Center of Quantum Matter
    Peking University)

  • Zheng Han

    (Shanxi University
    Shanxi University)

  • Jianpeng Liu

    (ShanghaiTech University
    ShanghaiTech University)

Abstract

Graphene has aroused great attention due to the intriguing properties associated with its low-energy Dirac Hamiltonian. When graphene is coupled with a correlated insulating substrate, electronic states that cannot be revealed in either individual layer may emerge in a synergistic manner. Here, we theoretically study the correlated and topological states in Coulomb-coupled and gate-tunable graphene-insulator heterostructures. By electrostatically aligning the electronic bands, charge carriers transferred between graphene and the insulator can yield a long-wavelength electronic crystal at the interface, exerting a superlattice Coulomb potential on graphene and generating topologically nontrivial subbands. This coupling can further boost electron-electron interaction effects in graphene, leading to a spontaneous bandgap formation at the Dirac point and interaction-enhanced Fermi velocity. Reciprocally, the electronic crystal at the interface is substantially stabilized with the help of cooperative interlayer Coulomb coupling. We propose a number of substrate candidates for graphene to experimentally demonstrate these effects.

Suggested Citation

  • Xin Lu & Shihao Zhang & Yaning Wang & Xiang Gao & Kaining Yang & Zhongqing Guo & Yuchen Gao & Yu Ye & Zheng Han & Jianpeng Liu, 2023. "Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41293-8
    DOI: 10.1038/s41467-023-41293-8
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    References listed on IDEAS

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    1. You Zhou & Jiho Sung & Elise Brutschea & Ilya Esterlis & Yao Wang & Giovanni Scuri & Ryan J. Gelly & Hoseok Heo & Takashi Taniguchi & Kenji Watanabe & Gergely Zaránd & Mikhail D. Lukin & Philip Kim & , 2021. "Bilayer Wigner crystals in a transition metal dichalcogenide heterostructure," Nature, Nature, vol. 595(7865), pages 48-52, July.
    2. Yuan Cao & Valla Fatemi & Shiang Fang & Kenji Watanabe & Takashi Taniguchi & Efthimios Kaxiras & Pablo Jarillo-Herrero, 2018. "Unconventional superconductivity in magic-angle graphene superlattices," Nature, Nature, vol. 556(7699), pages 43-50, April.
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