Special CPM Seminar

Weyl semi-metal: a new topological state in condensed matter

Xi Dai

Institute of Physics
Chinese Academy of Sciences

Weyl semi-metal (WSM) is a new topological state found recently in condensed matter. In this talk I will introduce the first experimentally observed WSM material - the TaAs family. I will show that the Weyl points in TaAs family can be derived from the topological invariances defined in some special planes in the k space. I will also introduce the main physical properties associated with such exotic quantum state including the Fermi arcs on the surface, the negative MR induced by chiral anomaly and the chiral magnetic effect.