Abstract
Based on the first-principles calculations, we recover the silent topological nature of CdAs, 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 nontrivial Fermi arcs on the surfaces. It can be driven into a topological insulator and a Weyl semimetal state by symmetry breaking, or into a quantum spin Hall insulator with a gap more than 100 meV by reducing dimensionality. We propose that the 3D Dirac cones in the bulk of CdAs can support sizable linear quantum magnetoresistance even up to room temperature.
- Received 29 May 2013
DOI:https://doi.org/10.1103/PhysRevB.88.125427
©2013 American Physical Society