2020/07/02 by Minoru Kawamura, Masataka Mogi, Ryutaro Yoshimi +7
Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Electron #Fractional quantum Hall effect #Graphene research and applications #Insulator (electricity) #Mathematics #Optoelectronics #Phase transition #Physics #Quantum #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Quantum phase transition #Quantum phases #Quantum spin Hall effect #Scaling #Topological Materials and Phenomena #Topological insulator #Topological order #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.102.041301
6 pages, 4 figures
arxiv created 2020/07/02 · openalex created_date 2020/07/10 · openalex publication_date 2020/07/16 · arxiv updated 2020/08/26 · openalex updated_date 2026/08/06
We report a current scaling study of a quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator on the surface of a heterostructure film of magnetic topological insulators. The transition was observed by tilting the magnetization while measuring the Hall conductivity \ensuremathσxy. The transition curves of \ensuremathσxy taken under various excitation currents cross each other at a single point, exemplifying a quantum critical behavior of the transition. The slopes of the transition curves follow a power-law dependence of the excitation current, giving a scaling exponent. Combining with the result of the previous temperature scaling study, critical exponents \ensuremathν for the localization length and p for the coherence length are separately evaluated as \ensuremathν=2.8\ifmmode±\else\textpm\fi0.3 and p=3.3\ifmmode±\else\textpm\fi0.3.