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

Deng, Peng; Zhang, Peng; Eckberg, Christopher; Chong, Su Kong; Yin, Gen; Emmanouilidou, Eve; Che, Xiaoyu; Ni, Ni; Wang, Kang L.

doi:10.1038/s41467-023-40784-y

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

Journal Article · Sat Sep 09 00:00:00 EDT 2023 · Nature Communications

DOI:https://doi.org/10.1038/s41467-023-40784-y· OSTI ID:2421732

^[1]; Zhang, Peng ^[2]; ^[3]; ^[2]; ^[2]; Emmanouilidou, Eve ^[2]; Che, Xiaoyu ^[2]; ^[2]; ^[2]

Univ. of California, Los Angeles, CA (United States); University of California Los Angeles, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States)
Fibertek Inc., Herndon, VA (United States); Army Research Lab., Adelphi, MD (United States); Army Research Lab., Playa Vista, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021117

OSTI ID:: 2421732

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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