Novel 2D Dirac and Weyl Semimetals

The discovery of graphene has stimulated enormous interest in two-dimensional (2D) electron gas with linear band structure. 2D Dirac materials possess many intriguing physical properties such as high carrier mobility and zero-energy Landau level for the relativistic dispersion and chiral spin/pseudospin texture. In this talk, we will discuss three new variants of 2D Dirac materials including (1) unpinned 2D Dirac semimetals in α-antimonene, (2) Rashba spin-split 2D Weyl semimetals, and (3) interacting Dirac states in graphene heterostructures. The results offer new insights into the relativistic behavior of electrons in reduced dimensions.