Tuning the Interplay of Magnetism and Band Topology in Intrinsic Magnetic Topological Insulators

Magnetic topological insulators provide a great platform for discovering new topological states, such as axion insulators, Chern insulators, and the 3D quantum anomalous Hall (QAH) insulators. Since the interplay of magnetism and band topology determines their topological natures, understanding and manipulating the magnetism inside magnetic topological materials will be crucial. In this talk, I will show that a continuous fine control of the magnetism and band topology can be made in the Mn-Bi-Te natural heterostructuraltopological insulator. Furthermore, I will show that the magnetic state can be easily switched between antiferromagnetic and ferromagnetic by external pressure, resulting in one more knob to tune the magnetic topological state. Therefore, our study provides a rare tunable material platform to realize various magnetic topological states.