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Recently, natural van der Waals heterostructures of (MnBi2Te4)m(Bi2Te3)n havebeen theoretically predicted and experimentally shown to host tunable magneticproperties and topologically nontrivial surface states. In this work, wesystematically investigate both the structural and electronic responses ofMnBi2Te4 and MnBi4Te7 to external pressure. In addition to the suppression ofantiferromagnetic order, MnBi2Te4 is found to undergo ametal-semiconductor-metal transition upon compression. The resistivity ofMnBi4Te7 changes dramatically under high pressure and a non-monotonic evolutionof \r{ho}(T) is observed. The nontrivial topology is proved to persists beforethe structural phase transition observed in the high-pressure regime. We findthat the bulk and surface states respond differently to pressure, which isconsistent with the non-monotonic change of the resistivity. Interestingly, apressure-induced amorphous state is observed in MnBi2Te4, while two highpressure phase transitions are revealed in MnBi4Te7. Our combined theoreticaland experimental research establishes MnBi2Te4 and MnBi4Te7 as highly tunablemagnetic topological insulators, in which phase transitions and new groundstates emerge upon compression.

Pressure-induced Topological and Structural Phase Transitions in an Antiferromagnetic Topological Insulator