ARPES studies on antiferromagnetic topological insulators MnBi_2nTe_3n+1

The intrinsic magnetic topological insulators are believed to be an ideal platform for the study of various topological quantum phenomena, including the quantum anomalous Hall effect and topological magnetoelectric effect. Recently, a van der Waals layered structure, MnBi₂Te₄, was proposed to be the first intrinsic antiferromagnetic topological insulator. Furthermore, the related MnBi_2nTe_3n+1 (n=2,3) heterostructures are considered to be new magnetic topological insulators with weak interlayer magnetic coupling. In this talk, we report angle-resolved photoemission spectroscopy (ARPES) studies on a series of the heterostructures MnBi_2nTe_3n+1 (n=1,2,3). Our results reveal that the intrinsic magnetic topological insulators MnBi_2nTe_3n+1 host a rich platform to realize various novel topological states.