Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 50: HL Poster IV
HL 50.20: Poster
Donnerstag, 15. März 2018, 19:00–21:00, Poster B
Topological Weyl semimetals of Bi1−xSbx alloys — •Yu-Hsin Su, Wujun Shi, Claudia Felser, and Yan Sun — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
Investigation on variety atomic composition and arrangement of bismuth antimony Bi1−xSbx alloys by making use of first-principle calculation has been accomplished and analysed. Firstly, the bulk of pure Bi and Sb have also been individually identified their topological invariant Z2 which shows Bi is topological trivial while Sb is topological non-trivial. As increasing the concentration of Sb (increase x), the topological phase will be anticipated more significantly. When x is larger than 0.5 in Bi1−xSbx alloys, it shows strong 3D topological insulator phase confirmed in previous research. Surprisingly, in our investigation, at particular concentrations x=0.5 and x=0.83 with specific inversion symmetry broken elemental arrangement, topological properties of weyl semimetal have been manifestly demonstrated from the emergence of Fermi arc. The Weyl semimetal phase provides a reasonable explanation for the current transport study of BiSb alloy with the violation of Ohm’s law [Nature Materials 16, 1096 (2017)]. This work shows that the plenty of topological phases in BiSb alloys depend on the collaboration of the elemental composition and their specific arrangement.