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Giant orbital magnetoelectric effect and current-induced magnetization switching in twisted bilayer graphene

Author

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  • Wen-Yu He

    (Hong Kong University of Science and Technology)

  • David Goldhaber-Gordon

    (Stanford University
    SLAC National Accelerator Laboratory)

  • K. T. Law

    (Hong Kong University of Science and Technology)

Abstract

Recently, quantum anomalous Hall effect with spontaneous ferromagnetism was observed in twisted bilayer graphenes (TBG) near 3/4 filling. Importantly, it was observed that an extremely small current can switch the direction of the magnetization. This offers the prospect of realizing low energy dissipation magnetic memories. However, the mechanism of the current-driven magnetization switching is poorly understood as the charge currents in graphenes are generally believed to be non-magnetic. In this work, we demonstrate that in TBG, the twisting and substrate induced symmetry breaking allow an out of plane orbital magnetization to be generated by a charge current. Moreover, the large Berry curvatures of the flat bands give the Bloch electrons large orbital magnetic moments so that a small current can generate a large orbital magnetization. We further demonstrate how the charge current can switch the magnetization of the ferromagnetic TBG near 3/4 filling as observed in the experiments.

Suggested Citation

  • Wen-Yu He & David Goldhaber-Gordon & K. T. Law, 2020. "Giant orbital magnetoelectric effect and current-induced magnetization switching in twisted bilayer graphene," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15473-9
    DOI: 10.1038/s41467-020-15473-9
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    Cited by:

    1. J. Díez-Mérida & A. Díez-Carlón & S. Y. Yang & Y.-M. Xie & X.-J. Gao & J. Senior & K. Watanabe & T. Taniguchi & X. Lu & A. P. Higginbotham & K. T. Law & Dmitri K. Efetov, 2023. "Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. 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.
    3. Daniel Kaplan & Tobias Holder & Binghai Yan, 2023. "General nonlinear Hall current in magnetic insulators beyond the quantum anomalous Hall effect," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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