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›› 2020, Vol. 37 ›› Issue (6): 736-743.DOI: 10.7523/j.issn.2095-6134.2020.06.003

• Research Articles • Previous Articles     Next Articles

Correlation-driven topological phase transition from quantum anomalous Hall insulator to Mott insulator in monolayer VCl3 and VBr3

XU Yongfeng1, SHENG Xianlei2, ZHENG Qingrong1   

  1. 1 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    2 Key Laboratory of Micro-Nano Measurement-Manipulation and Physics of Ministry of Education, Department of Physics, Beihang University, Beijing 100191, China
  • Received:2019-03-26 Revised:2019-05-08 Online:2020-11-15
  • Supported by:
    Supported by the National Natural Science Foundation of China(11574309,11504013)

Abstract: Based on the first-principle calculations, we propose that the monolayer VCl3 and VBr3 are quantum anomalous Hall insulators with in-plane magnetization without considering the correlation effect of the 3d electron-electron interaction. The band gap is predicted to be about 3.4 meV for VCl3, but no global gap for VBr3. It is interesting to note that VCl3 (VBr3) possesses a Chern number of C=3 (C=1) with three (one) chiral edge states. After considering correlation effect, we obtain Mott insulator if U>0.45 (U>0.35) eV for VCl3 (VBr3).

Key words: ferromagnetic semiconductor, large Chern number, Mott insulator

CLC Number: