Scaling behavior of the quantum phase transition from a quantum-anomalous-Hall insulator to an axion insulator

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

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The phase transitions from one plateau to the next plateau or to an insulator in quantum Hall and quantum anomalous Hall (QAH) systems have revealed universal scaling behaviors. A magnetic-field-driven quantum phase transition from a QAH insulator to an axion insulator was recently demonstrated in magnetic topological insulator sandwich samples. Here, we show that the temperature dependence of the derivative of the longitudinal resistance on magnetic field at the transition point follows a characteristic power-law that indicates a universal scaling behavior for the QAH to axion insulator phase transition. Similar to the quantum Hall plateau to plateau transition, the QAH to axion insulator transition can also be understood by the Chalker–Coddington network model. We extract a critical exponent κ ~ 0.38 ± 0.02 in agreement with recent high-precision numerical results on the correlation length exponent of the Chalker–Coddington model at ν ~ 2.6, rather than the generally-accepted value of 2.33.

Original languageEnglish (US)
Article number4532
JournalNature communications
Volume11
Issue number1
DOIs
StatePublished - Dec 1 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Scaling behavior of the quantum phase transition from a quantum-anomalous-Hall insulator to an axion insulator'. Together they form a unique fingerprint.

Cite this