Three-dimensional Dirac semimetal and quantum transport in Cd sub(3)As sub(2)

Based on the first-principles calculations, we recover the silent topological nature of Cd sub(3) As sub(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 (3D) Dirac points in the bulk and...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-09, Vol.88 (12)
Main Authors: Wang, Zhijun, Weng, Hongming, Wu, Quansheng, Dai, Xi, Fang, Zhong
Format: Article
Language:English
Subjects:
Broken symmetry
Condensed matter
Insulators
Magnetoresistivity
Metalloids
Semiconductors
Three dimensional
Topology
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Summary:Based on the first-principles calculations, we recover the silent topological nature of Cd sub(3) As sub(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 (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 Cd sub(3) As sub(2) can support sizable linear quantum magnetoresistance even up to room temperature.
ISSN:1098-0121
1550-235X