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Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures

Author

Listed:
  • Kaijie Yang

    (the Pennsylvania State University)

  • Zian Xu

    (Beihang University)

  • Yanjie Feng

    (Beihang University)

  • Frank Schindler

    (Imperial College London)

  • Yuanfeng Xu

    (Zhejiang University
    Princeton University)

  • Zhen Bi

    (the Pennsylvania State University)

  • B. Andrei Bernevig

    (Princeton University
    Donostia International Physics Center
    Basque Foundation for Science)

  • Peizhe Tang

    (Beihang University
    Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science)

  • Chao-Xing Liu

    (the Pennsylvania State University
    Princeton University)

Abstract

The presence of topological flat minibands in moiré materials provides an opportunity to explore the interplay between topology and correlation. In this work, we study moiré minibands in topological insulator films with two hybridized surface states under a moiré superlattice potential created by two-dimensional insulating materials. We show the lowest conduction (highest valence) Kramers’ pair of minibands can be $${{\mathbb{Z}}}_{2}$$ Z 2 non-trivial when the minima (maxima) of moiré potential approximately form a hexagonal lattice with six-fold rotation symmetry. Coulomb interaction can drive the non-trivial Kramers’ minibands into the quantum anomalous Hall state when they are half-filled, which is further stabilized by applying external gate voltages to break inversion. We propose the monolayer Sb2 on top of Sb2Te3 films as a candidate based on first principles calculations. Our work demonstrates the topological insulator based moiré heterostructure as a potential platform for studying interacting topological phases.

Suggested Citation

  • Kaijie Yang & Zian Xu & Yanjie Feng & Frank Schindler & Yuanfeng Xu & Zhen Bi & B. Andrei Bernevig & Peizhe Tang & Chao-Xing Liu, 2024. "Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46717-7
    DOI: 10.1038/s41467-024-46717-7
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    References listed on IDEAS

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    1. 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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