A special triple point in non-centrosymmetric materials Zn3In2Se6 and In2Se3 |
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| Institution: | 1. Tin Ka-Ping College of Science, University of Shanghai for Science and Technology, Shanghai, 200093, China;2. Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;3. Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;4. Department of Physics, Fudan University, Shanghai, 200433, China |
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| Abstract: | We predict that the non-centrosymmetric materials Zn3In2Se6 and In2Se3 are the symmetry protected topological critical triple point metals based on first principles calculation. The dispersion along the Γ-Z line almost vanishes because of the particular crystal structure, and the strain along the c direction maybe drives accidental Dirac point to triple point. An effective theory is developed to describe accidental Dirac points and triple points, by which we calculate the surface states. These materials provide us a new platform to discuss the relation between the triple points and Dirac points. |
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| Keywords: | Non-centrosymmetric Triple point Accidental Dirac point Topological semimetal |
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