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Based on the first-principles calculations, we recover the silent topologicalnature of Cd3As2, a well known semiconductor with high carrier mobility. Wefind that it is a symmetry-protected topological semimetal with a single pairof three-dimensional (3D) Dirac points in the bulk and non-trivial Fermi arcson the surfaces. It can be driven into a topological insulator and a Weylsemi-metal state by symmetry breaking, or into a quantum spin Hall insulatorwith gap more than 100meV by reducing dimensionality. We propose that the 3DDirac cones in the bulk of Cd3As2 can support sizable linear quantummagnetoresistance even up to room temperature.

Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2