文章基本信息

标题：Stanene cyanide: a novel candidate of Quantum Spin Hall insulator at high temperature
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作者：Wei-xiao Ji ; Chang-wen Zhang ; Meng Ding 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep18604
出版社：Springer Nature
摘要：The search for quantum spin Hall (QSH) insulators with high stability, large and tunable gap and topological robustness, is critical for their realistic application at high temperature. Using first-principle calculations, we predict the cyanogen saturated stanene SnCN as novel topological insulators material, with a bulk gap as large as 203 meV, which can be engineered by applying biaxial strain and electric field. The band topology is identified by Z₂ topological invariant together with helical edge states, and the mechanism is s-p _xy band inversion at G point induced by spin-orbit coupling (SOC). Remarkably, these systems have robust topology against chemical impurities, based on the calculations on halogen and cyano group co-decorated stanene SnX x X′1 −x (X,X′ = F, Cl, Br, I and CN), which makes it an appropriate and flexible candidate material for spintronic devices.