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Imaging the Breakdown and Restoration of Topological Protection in Magnetic Topological Insulator MnBi<sub>2</sub>Te<sub>4</sub>
Quantum anomalous Hall (QAH) insulators transport charge without resistance along topologically protected chiral 1D edge states. Yet, in magnetic topological insulators to date, topological protection is far from robust, with zero-magnetic field QAH effect only realized at temperatures an order of magnitude below the Néel temperature T