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Quantum spin Hall state in cyanided dumbbell stanene
- Source :
- RSC Advances. 6:86089-86094
- Publication Year :
- 2016
- Publisher :
- Royal Society of Chemistry (RSC), 2016.
-
Abstract
- Searching for two-dimensional (2D) quantum spin Hall (QSH) insulators with a large band gap, in which the Quantum spin Hall effect (QSHE) can be observed at high temperature, is an important goal for condensed matter physics researchers. Based on first principles calculations, we predict that the band gap of dumbbell stanene can be enhanced to 52 meV with cyano group decoration (DB-SnCN), which can be further tuned to be 322 meV by applying lattice strains. The band topology is identified by Z2 topological invariance together with helical edge states, and the mechanism can be understood with px–py band inversion at the Γ point induced by spin-orbit coupling (SOC). These findings provide bright and significant guidance for future fabrication and realistic applications of spintronics.
- Subjects :
- Physics
Fabrication
Spintronics
Condensed matter physics
Band gap
General Chemical Engineering
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Quantum spin Hall effect
Lattice (order)
Quantum mechanics
0103 physical sciences
Stanene
Edge states
Dumbbell
010306 general physics
0210 nano-technology
Subjects
Details
- ISSN :
- 20462069
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- RSC Advances
- Accession number :
- edsair.doi...........fb62016a190638cd37540cd5d9b0287b