Abstract

Weyl semi-metal (WSM) is a new topological state found recently in condensed matter. In this talk I will introduce the mechanisms for the formation of WSM states in two families of such materials, TaAs family[1] and CeRu4Sn6[2]. By applying different first principle methods for both weakly and strongly correlated materials, we can resolve the positions of Weyl points in the momentum space for both materials. I will then introduce the main physical properties associated with such exotic quantum state including the Fermi arcs[3] on the surface, the negative MR induced by chiral anomaly[4] and the chiral magnetic effect.

 

 

Aboust the Speaker

Prof Xi Dai graduated from Zhejiang University in 1993 and received Ph.D. from Institute of Theoretical Physics, CAS in 1999. After that he did postdoctoral research in HKUST, Boston College and Rutgers University from 1999 to 2004. From 2004 to 2007, he worked in the University of Hong Kong as Research Assistant Professor. He moved back to CAS as professor in Institute of Physics, CAS in March 2007 and has worked there until now. During the recent ten years, Prof Dai has made several important contributions to the research of topological materials, including the predictions of new materials for three dimensional topological insulator, quantum anomalous Hall effect and Weyl semi-metal phases. Based on his scientific accomplishments, he received several awards recently, including the Qiushi group prize for Science and Technology in 2011, The OCPA “Achievements in Asia Award” in 2012 and “Fundamental Physics Prize” from the KC Chou foundation in 2014.