Abstract
AbstractGroup III-V films are of great importance for their potential application in spintronics and quantum computing. Search for two-dimensional III-V films with a nontrivial large-gap are quite crucial for the realization of dissipationless transport edge channels using quantum spin Hall (QSH) effects. Here we use first-principles calculations to predict a class of large-gap QSH insulators in functionalized TlSb monolayers (TlSbX2; (X = H, F, Cl, Br, I)), with sizable bulk gaps as large as 0.22 ~ 0.40 eV. The QSH state is identified by Z2 topological invariant together with helical edge states induced by spin-orbit coupling (SOC). Noticeably, the inverted band gap in the nontrivial states can be effectively tuned by the electric field and strain. Additionally, these films on BN substrate also maintain a nontrivial QSH state, which harbors a Dirac cone lying within the band gap. These findings may shed new light in future design and fabrication of QSH insulators based on two-dimensional honeycomb lattices in spintronics.
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Dates
Type | When |
---|---|
Created | 9 years, 6 months ago (Feb. 17, 2016, 5:57 a.m.) |
Deposited | 2 years, 7 months ago (Jan. 4, 2023, 8:44 a.m.) |
Indexed | 1 year, 1 month ago (July 9, 2024, 4:27 a.m.) |
Issued | 9 years, 6 months ago (Feb. 17, 2016) |
Published | 9 years, 6 months ago (Feb. 17, 2016) |
Published Online | 9 years, 6 months ago (Feb. 17, 2016) |
@article{Zhang_2016, title={Functionalized Thallium Antimony Films as Excellent Candidates for Large-Gap Quantum Spin Hall Insulator}, volume={6}, ISSN={2045-2322}, url={http://dx.doi.org/10.1038/srep21351}, DOI={10.1038/srep21351}, number={1}, journal={Scientific Reports}, publisher={Springer Science and Business Media LLC}, author={Zhang, Run-wu and Zhang, Chang-wen and Ji, Wei-xiao and Li, Sheng-shi and Yan, Shi-shen and Li, Ping and Wang, Pei-ji}, year={2016}, month=feb }