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Perspective—The Elusive Quantum Anomalous Hall Effect in MnBi2Te4: Materials


 Observation of the quantum anomalous Hall effect (QAHE) in MnBi2Te4 fakes is one of the most exciting results in the study of the intrinsic magnetic topological insulator MnBi2Te4 and related compounds. This fascinating result is yet to be reproduced two years after its first report. The quality of starting MnBi2Te4 crystals is believed to be a key factor. An interesting and important question to address is what is the correct quality to enable the QAHE. Here, we present possible approaches to tuning the magnetic and topological properties of MnBi2Te4 using lattice imperfections, strain, stacking sequence, and interactions between the substrate and flakes/films.