Symmetry enforced chiral hinge states and surface quantum anomalous Hall effect (SQAHE) in magnetic topological insulators, séminaire par Xi Dai

Xi Dai (Hong Kong University)

The criteria to have chiral and helical hinge states in 3D materials is proposed and discussed, which can lead to exotic transport phenomenon, the quantum anomalous Hall and spin Hall effects on some special surfaces of the 3D materials. After that, some realistic material systems are also proposed to realize these exotic hinge states by combing the first principle calculations and the Green’s function techniques. A physically accessible way to manipulating the SQAHE is also proposed, which makes it very different with the QAHE in ordinary 2D systems.