期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 25, 页码 16624-16629出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp00046g
关键词
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资金
- National Basic Research Program of China [2012CB932302]
- National Natural Science Foundation of China [91221101, 21433006]
- 111 project [B13209]
- Taishan Scholar Program of Shandong
- National Super Computing Centre in Jinan
A quantum spin Hall (QSH) effect is quite promising for applications in spintronics and quantum computations, but at present, can only be achieved at ultralow temperatures. The determination of large-gap QSH insulators is critical to increase the operating temperature. By using first-principles calculations, we demonstrate that the stable hydrogenated stanene with a dumbbell-like structure (DB stanane) has large topological nontrivial band gaps of 312 meV (G point) and 160 meV for the bulk, characterized by a topological invariant of Z(2) = 1 because of s-p(xy) band inversion. Helical gapless edge states appear in the nanoribbon structures with high Fermi velocity comparable to that of graphene. The nontrivial topological states are robust against the substrate effects. The realization of this material is a feasible solution for the applications of QSH effects at room temperature and can be beneficial in the fabrication of highspeed spintronics devices.
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