Evolution of Berry curvature and reentrant quantum anomalous Hall effect in an intrinsic magnetic topological insulator

作     者：Chui-Zhen Chen Junjie Qi Dong-Hui Xu XinCheng Xie Chui-Zhen Chen;Junjie Qi;Dong-Hui Xu;XinCheng Xie

作者机构：Institute for Advanced Study and School of Physical Science and TechnologySoochow UniversitySuzhou 215006China Beijing Academy of Quantum Information SciencesBeijing 100193China Department of PhysicsHubei UniversityWuhan 430062China International Center for Quantum MaterialsSchool of PhysicsPeking UniversityBeijing 100871China CAS Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100190China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2021年第64卷第12期

页      面：138-143页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No.XDB28000000) the National Basic Research Program of China (Grant No.2019YFA0308403) the National Natural Science Foundation of China (Grant Nos.11534001,12074108,11704106,and 11974256) funded by the Natural Science Foundation of Jiangsu Province (Grant No.BK20190813) the Priority Academic Program Development of Jiangsu Higher Education Institutions supported by the Chutian Scholars Program in Hubei Province。 

主　　题：quantum anomalous Hall effect Berry curvature disorder localization 

摘      要：Recently, the magnetic topological insulator(TI) MnBi2Te4 emerged as a competitive platform to realize quantum anomalous Hall(QAH) states. We report a Berry curvature splitting mechanism to realize the QAH effect in the disordered magnetic TI multilayers when switching from an antiferromagnetic order to a ferromagnetic order. We reveal that the splitting of spin-resolved Berry curvature, originating from the separation of the critical points during the magnetic switching, can give rise to a QAH insulator. We present a global phase diagram, and also provide a phenomenological picture to elucidate the Berry curvature splitting mechanism by the evolution of topological charges. At last, we predict that the Berry curvature splitting mechanism will lead to a reentrant QAH effect, which can be detected by tuning the gate voltage. Our theory will be instructive for the studies of the QAH effect in MnBi2Te4 in future experiments.