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

Peng Deng (), Peng Zhang, Christopher Eckberg, Su Kong Chong, Gen Yin, Eve Emmanouilidou, Xiaoyu Che, Ni Ni and Kang L. Wang ()
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Peng Deng: University of California Los Angeles
Peng Zhang: University of California Los Angeles
Christopher Eckberg: Fibertek Inc
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

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-40784-y

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