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Quantum anomalous Hall octet driven by orbital magnetism in bilayer graphene

Author

Listed:
  • Fabian R. Geisenhof

    (Ludwig-Maximilians-Universität München)

  • Felix Winterer

    (Ludwig-Maximilians-Universität München)

  • Anna M. Seiler

    (Ludwig-Maximilians-Universität München)

  • Jakob Lenz

    (Ludwig-Maximilians-Universität München)

  • Tianyi Xu

    (University of Texas at Dallas)

  • Fan Zhang

    (University of Texas at Dallas)

  • R. Thomas Weitz

    (Ludwig-Maximilians-Universität München
    Center for Nanoscience (CeNS)
    Munich Center for Quantum Science and Technology (MCQST)
    University of Göttingen)

Abstract

The quantum anomalous Hall (QAH) effect—a macroscopic manifestation of chiral band topology at zero magnetic field—has been experimentally realized only by the magnetic doping of topological insulators1–3 and the delicate design of moiré heterostructures4–8. However, the seemingly simple bilayer graphene without magnetic doping or moiré engineering has long been predicted to host competing ordered states with QAH effects9–11. Here we explore states in bilayer graphene with a conductance of 2 e2 h−1 (where e is the electronic charge and h is Planck’s constant) that not only survive down to anomalously small magnetic fields and up to temperatures of five kelvin but also exhibit magnetic hysteresis. Together, the experimental signatures provide compelling evidence for orbital-magnetism-driven QAH behaviour that is tunable via electric and magnetic fields as well as carrier sign. The observed octet of QAH phases is distinct from previous observations owing to its peculiar ferrimagnetic and ferrielectric order that is characterized by quantized anomalous charge, spin, valley and spin–valley Hall behaviour9.

Suggested Citation

  • Fabian R. Geisenhof & Felix Winterer & Anna M. Seiler & Jakob Lenz & Tianyi Xu & Fan Zhang & R. Thomas Weitz, 2021. "Quantum anomalous Hall octet driven by orbital magnetism in bilayer graphene," Nature, Nature, vol. 598(7879), pages 53-58, October.
    • Handle: RePEc:nat:nature:v:598:y:2021:i:7879:d:10.1038_s41586-021-03849-w
    DOI: 10.1038/s41586-021-03849-w
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    Cited by:

    1. Manabendra Kuiri & Christopher Coleman & Zhenxiang Gao & Aswin Vishnuradhan & Kenji Watanabe & Takashi Taniguchi & Jihang Zhu & Allan H. MacDonald & Joshua Folk, 2022. "Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    2. Anna M. Seiler & Nils Jacobsen & Martin Statz & Noelia Fernandez & Francesca Falorsi & Kenji Watanabe & Takashi Taniguchi & Zhiyu Dong & Leonid S. Levitov & R. Thomas Weitz, 2024. "Probing the tunable multi-cone band structure in Bernal bilayer graphene," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    3. Fabian R. Geisenhof & Felix Winterer & Anna M. Seiler & Jakob Lenz & Ivar Martin & R. Thomas Weitz, 2022. "Interplay between topological valley and quantum Hall edge transport," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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