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DS: Fachverband Dünne Schichten

DS 1: Transport: Topological Insulators (jointly with DS, MA, HL, O)

DS 1.4: Vortrag

Montag, 20. März 2017, 10:15–10:30, HSZ 204

Emergence of topological and topological crystalline phases in TlBiS₂ and TlSbS₂ — •Udo Schwingenschlögl, Qingyun Zhang, and Yingchun Cheng — King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia

Using first-principles calculations, we investigate the band structure evolution and topological phase transitions in TlBiS₂ and TlSbS₂ under hydrostatic pressure as well as uniaxial and biaxial strain. The phase transitions are identified by parity analysis and by calculating the surface states. Zero, one, and four Dirac cones are found for the (111) surfaces of both TlBiS₂ and TlSbS₂ when the pressure grows, which confirms trivial-nontrivial-trivial phase transitions. The Dirac cones at the M points are anisotropic with large out-of-plane component. TlBiS₂ shows normal, topological, and topological crystalline insulator phases under hydrostatic pressure, thus being the first compound to exhibit a phase transition from a topological to a topological crystalline insulator. [1] Scientific Reports 5, 8379 (2015)