Dual Topological Features of Weyl Semimetallic Phases in Tetradymite BiSbTe$_{3}$
Z. Z. Zhou1, H. J. Liu2, G. Y. Wang3, R. Wang1*, and X. Y. Zhou1*
1Center for Quantum Materials and Devices, College of Physics, Chongqing University, Chongqing 401331, China 2Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, and School of Physics and Technology, Wuhan University, Wuhan 430072, China 3Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Science, Chongqing 400714, China
Abstract：Based on first-principles calculations and symmetry arguments, we reveal that the non-centrosymmetric ternary tetradymite BiSbTe$_{3}$ possesses exotic dual topological features of Weyl semimetallic phases with $Z_{2}$ index (1:000). The results show that the helical Dirac-type surface states protected by the time-reversal symmetry are present in the vicinity of the Brillouin zone center, which is consistent with the experimental report. Furthermore, we show that four pairs of Weyl points reside exactly at the Fermi level, which are guaranteed to be located on high-symmetry planes due to mirror symmetries. The helical surface states and the projected Weyl nodes are well separated in the momentum space, facilitating their observations in experiments. This work not only uncovers a unique quantum phenomenon with dual topological features in the tetradymite family but also paves a fascinating avenue for exploring the coexistence of multi-topological states with wide applications.
. [J]. 中国物理快报, 2021, 38(7): 77101-.
Z. Z. Zhou, H. J. Liu, G. Y. Wang, R. Wang, and X. Y. Zhou. Dual Topological Features of Weyl Semimetallic Phases in Tetradymite BiSbTe$_{3}$. Chin. Phys. Lett., 2021, 38(7): 77101-.
2021, Vol. 38 
