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Hydrogenation-induced large-gap quantum-spin-Hall insulator states in a germanium–tin dumbbell structure
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chen, Xin Li, Linyang Zhao, Mingwen |
| Copyright Year | 2015 |
| Abstract | The quantum spin Hall (QSH) effect in two-dimensional topological insulators (2D TIs) is promising for building nanoscaled devices with low energy consumption. The 2D TIs with a bulk band gap larger than the atomic thermal motion energy at room temperature (∼26 meV) are essential for achieving room-temperature QSH effects. We proved from first-principles that this goal may be reached in a hydrogenated germanium–tin (Sn6Ge4H4) dumbbell (DB) structure, where spin–orbit coupling (SOC) opens a bulk band gap of 235 meV. The topological nontriviality is related to the band inversion of s–pxy of Sn atoms induced by surface hydrogenation and can be characterized by a topological invariant of Z2 = 1. This work offers a promising candidate material for achieving long-desired room-temperature QSH effects. |
| Starting Page | 72462 |
| Ending Page | 72468 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C5RA10712A |
| Alternate Webpage(s) | https://pubs.rsc.org/en/content/getauthorversionpdf/C5RA10712A |
| Alternate Webpage(s) | https://doi.org/10.1039/C5RA10712A |
| Volume Number | 5 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
