Three-dimensional Dirac semimetal and quantum transport in Cd3As2

Zhijun Wang, Hongming Weng, Quansheng Wu, Xi Dai, Zhong Fang
2013 Physical Review B  
Based on the first-principles calculations, we recover the silent topological nature of Cd3As2, a well known semiconductor with high carrier mobility. We find that it is a symmetry-protected topological semimetal with a single pair of three-dimensional (3D) Dirac points in the bulk and non-trivial Fermi arcs on the surfaces. It can be driven into a topological insulator and a Weyl semi-metal state by symmetry breaking, or into a quantum spin Hall insulator with gap more than 100meV by reducing
more » ... imensionality. We propose that the 3D Dirac cones in the bulk of Cd3As2 can support sizable linear quantum magnetoresistance even up to room temperature.
doi:10.1103/physrevb.88.125427 fatcat:da2j4chlenhjjcddhwzac4fyoe