2010/03/12 by H. Lin, Hsin Lin, Lin, H. +13 · 3 citations
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Physics (quant-ph) #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.mtrl-sci #quant-ph
paper · pdf · doi:10.48550/arxiv.1003.2615
5 pages, 3 figures
arxiv created 2010/03/12 · openalex publication_date 2010/03/12 · arxiv updated 2010/03/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have investigated several classes of strong spin-orbit chalcogenides related to the (Pb,Sn)Te series studied in connection with the Dirac fermion physics in the 1980s. Our first-principle theoretical calculations suggest that ternary chalcogenides TlBiX2 and TlSbX2 (X=Te, Se, S) series harbor small bandgap topological insulators with single Dirac cone on some selective surfaces whereas the isostructural and isoelectronic silver-based AgBiX2 and AgSbX2 (X=Te, Se, S) series do not. We find that several Tl-compounds are in the vicinity of a topological critical point. We identify the precise surface termination that realizes the single Dirac cone. The single-Dirac-cone surface is shown to be correlated with a termination that minimizes dangling bonding effects favorable for ARPES experiments. Our results further suggest that this class of topological semi-metals may harbor odd-parity topological superconductors similar to the possibility proposed for CuxBi2Se3 (Tc ~ 4K).