Theoretical Prediction of Topological Insulators in Thallium-based III-V-VI$ 2$ Ternary Chalcogenides - Condensed Matter > Materials ScienceReport as inadecuate




Theoretical Prediction of Topological Insulators in Thallium-based III-V-VI$ 2$ Ternary Chalcogenides - Condensed Matter > Materials Science - Download this document for free, or read online. Document in PDF available to download.

Abstract: We predict a new class of three dimensional topological insulators inthallium-based III-V-VI$ 2$ ternary chalcogenides, including TlBiQ$ 2$ andTlSbQ$ 2$ Q = Te, Se and S. These topological insulators have robust andsimple surface states consisting of a single Dirac cone at the $\Gamma$ point.The mechanism for topological insulating behavior is elucidated using bothfirst principle calculations and effective field theory models. Remarkably, onetopological insulator in this class, TlBiTe$ 2$ is also a superconductor whendoped with $p$-type carriers. We discuss the possibility that this materialcould be a topological superconductor. Another material TlSbS$ 2$ is on theborder between topological insulator and trivial insulator phases, in which atopological phase transition can be driven by pressure.



Author: Binghai Yan, Chao-Xing Liu, Hai-Jun Zhang, Chi-Yung Yam, Xiao-Liang Qi, Thomas Frauenheim, Shou-Cheng Zhang

Source: https://arxiv.org/



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