Speaker
Description
The theoretical prediction and experimental validation of Na3Bi and Cd3As2 Dirac semimetals, as well as the TaAs-class Weyl semimetals, stimulated considerable research efforts aiming at extending the family of topological semimetals. Several new classes of gapless topological phases such as the topological nodal-line, nodal-chain, and nodal-net systems as well as high-dimensional fermions quasiparticles have been predicted. In the meantime, a large number of candidate materials hosting these novel topological phases have been determined from first principles. In this talk, I will present a new Dirac semimetal MgTa2N3 predicted by the first-principle calculation. The electronic structure and its related topological properties will be discussed. Besides, I will also speak about topological phase transitions in topological semimetals induced by the symmetry breaking.
