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Quantized resistance revealed at the criticality of the quantum anomalous Hall phase transitions

Author

Listed:
  • Peng Deng

    (University of California Los Angeles)

  • Peng Zhang

    (University of California Los Angeles)

  • Christopher Eckberg

    (Fibertek Inc
    US Army Research Laboratory
    US Army Research Laboratory)

  • Su Kong Chong

    (University of California Los Angeles)

  • Gen Yin

    (University of California Los Angeles)

  • Eve Emmanouilidou

    (University of California Los Angeles)

  • Xiaoyu Che

    (University of California Los Angeles)

  • Ni Ni

    (University of California Los Angeles)

  • Kang L. Wang

    (University of California Los Angeles
    University of California Los Angeles)

Abstract

In multilayered magnetic topological insulator structures, magnetization reversal processes can drive topological phase transitions between quantum anomalous Hall, axion insulator, and normal insulator states. Here we report an examination of the critical behavior of two such transitions: the quantum anomalous Hall to normal insulator (QAH-NI), and quantum anomalous Hall to axion insulator (QAH-AXI) transitions. By introducing a new analysis protocol wherein temperature dependent variations in the magnetic coercivity are accounted for, the critical behavior of the QAH-NI and QAH-AXI transitions are evaluated over a wide range of temperature and magnetic field. Despite the uniqueness of these different transitions, quantized longitudinal resistance and Hall conductance are observed at criticality in both cases. Furthermore, critical exponents were extracted for QAH-AXI transitions occurring at magnetization reversals of two different magnetic layers. The observation of consistent critical exponents and resistances in each case, independent of the magnetic layer details, demonstrates critical behaviors in quantum anomalous Hall transitions to be of electronic rather than magnetic origin. Our finding offers a new avenue for studies of phase transition and criticality in QAH insulators.

Suggested Citation

  • Peng Deng & Peng Zhang & Christopher Eckberg & Su Kong Chong & Gen Yin & Eve Emmanouilidou & Xiaoyu Che & Ni Ni & Kang L. Wang, 2023. "Quantized resistance revealed at the criticality of the quantum anomalous Hall phase transitions," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40784-y
    DOI: 10.1038/s41467-023-40784-y
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    References listed on IDEAS

    as
    1. Abhinav Kandala & Anthony Richardella & Susan Kempinger & Chao-Xing Liu & Nitin Samarth, 2015. "Giant anisotropic magnetoresistance in a quantum anomalous Hall insulator," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    2. Xinyu Wu & Di Xiao & Chui-Zhen Chen & Jian Sun & Ling Zhang & Moses H. W. Chan & Nitin Samarth & X. C. Xie & Xi Lin & Cui-Zu Chang, 2020. "Scaling behavior of the quantum phase transition from a quantum-anomalous-Hall insulator to an axion insulator," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    3. Peng Deng & Christopher Eckberg & Peng Zhang & Gang Qiu & Eve Emmanouilidou & Gen Yin & Su Kong Chong & Lixuan Tai & Ni Ni & Kang L. Wang, 2022. "Probing the mesoscopic size limit of quantum anomalous Hall insulators," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
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