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Experimental progress on the quantum anomalous Hall(QAH)effect has been significantly accelerated recently by the discovery of an intrinsic magnetic topo-logical insulator MnBi2Te4[1].The ma-terial is natively antiferromagnetic,but an external magnetic field of several tesla can overcome its weak interlayer antiferromagnetic coupling,making it ferromagnetic.Interestingly,ferromag-netic MnBi2Te4 is predicted to be a magnetic Weyl semimetal,a topological phase hunted for almost a decade but with few cases confirmed experimentally[2].