Zhijun Wang, Hongming Weng, Quansheng Wu, Xi Dai, Zhong Fang
Based on the first-principles calculations, we recover the silent topological nature of Cd$_3$As$_2$, 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 Dirac points in the bulk and non-trivial Fermi arcs on the surfaces. Around the Dirac points, the energy bands have complete splitting, in contrast to other examples. It can be driven into a topological insulator or a Weyl semi-metal state by systematical symmetry breaking, and the quantum spin Hall effect can be realized in its quantum well structure.
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http://arxiv.org/abs/1305.6780
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