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

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