RAC1 Journal Club/Seminar Series

Xiaodong Ma: Topological insulator and the quantum anomalous Hall effect

The quantum anomalous Hall effect (QAHE) is defined as a quantized Hall effect in a system without an external magnetic field. Its physical origin relies on the intrinsic topological inverted band structure and ferromagnetism. Since the QAHE does not require external energy input in the form of magnetic field, it is believed that this effect can be applied in electric devices that consume little energy. In this seminar, I will talk about the ideas of the topological insulator and our work on introducing ferromagnetism in a topological insulator system which may observe QAHE.