Reentrant quantum anomalous Hall effect in molecular beam epitaxy-grown MnBi2Te4 thin films
arxiv(2024)
摘要
In this study, we investigate intrinsic magnetic topological insulator
MnBi2Te4 thin films grown by molecular beam epitaxy. We observe a reentrant
quantum anomalous Hall effect when the Fermi energy enters the valance band and
magnetic field equals zero, indicating the emergence of the Chern Anderson
insulator state. The discovery opens a new avenue for realizing the QAH effect
and underscores the fundamental role of both Berry curvature and Anderson
localization.
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