Electronic structures of magnetic topological insulator*

In the past decade, the correlation between symmetry and topology have taken the central stage of modern physics. It has attracted intensive research interests in condensed matter physics and materials science since the discovery of various topological materials such as quantum spin Hall insulators, 3D topological insulators, and inversion-symmetry breaking Weyl semimetals. Despite tremendous progress, the majority of known topological materials are nonmagnetic while the novel magnetic topological materials have remains elusive. In the last few years, the focus has shifted from nonmagnetic phase to magnetic topological material. In this talk, we will review a range of materials including antiferromagnetic topological insulator [1], magnetic kagome family RMn₆Sn₆ (R = Tb,Gd) [2], axion insulator [3], and the antisite effects in magnetic topological phase transitions [4] via first-principles calculations, and discuss various exotic phenomena observed experimentally in these new materials.