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Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3)

Quantum Spin Hall (QSH) has potential applications in low energy consuming spintronic devices and has become a researching hotspot recently. It benefits from insulators feature edge states, topologically protected from backscattering by time-reversal symmetry. The properties of methyl functionalized...

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Autores principales: Ren, Ceng-Ceng, Ji, Wei-Xiao, Zhang, Shu-Feng, Zhang, Chang-Wen, Li, Ping, Wang, Pei-Ji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163979/
https://www.ncbi.nlm.nih.gov/pubmed/30205466
http://dx.doi.org/10.3390/nano8090698
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author Ren, Ceng-Ceng
Ji, Wei-Xiao
Zhang, Shu-Feng
Zhang, Chang-Wen
Li, Ping
Wang, Pei-Ji
author_facet Ren, Ceng-Ceng
Ji, Wei-Xiao
Zhang, Shu-Feng
Zhang, Chang-Wen
Li, Ping
Wang, Pei-Ji
author_sort Ren, Ceng-Ceng
collection PubMed
description Quantum Spin Hall (QSH) has potential applications in low energy consuming spintronic devices and has become a researching hotspot recently. It benefits from insulators feature edge states, topologically protected from backscattering by time-reversal symmetry. The properties of methyl functionalized silicene (SiCH(3)) have been investigated using first-principles calculations, which show QSH effect under reasonable strain. The origin of the topological characteristic of SiCH(3), is mainly associated with the s-p(xy) orbitals band inversion at Γ point, whilst the band gap appears under the effect of spin-orbital coupling (SOC). The QSH phase of SiCH(3) is confirmed by the topological invariant Z(2) = 1, as well as helical edge states. The SiCH(3) supported by hexagonal boron nitride (BN) film makes it possible to observe its non-trivial topological phase experimentally, due to the weak interlayer interaction. The results of this work provide a new potential candidate for two-dimensional honeycomb lattice spintronic devices in spintronics.
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spelling pubmed-61639792018-10-10 Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3) Ren, Ceng-Ceng Ji, Wei-Xiao Zhang, Shu-Feng Zhang, Chang-Wen Li, Ping Wang, Pei-Ji Nanomaterials (Basel) Article Quantum Spin Hall (QSH) has potential applications in low energy consuming spintronic devices and has become a researching hotspot recently. It benefits from insulators feature edge states, topologically protected from backscattering by time-reversal symmetry. The properties of methyl functionalized silicene (SiCH(3)) have been investigated using first-principles calculations, which show QSH effect under reasonable strain. The origin of the topological characteristic of SiCH(3), is mainly associated with the s-p(xy) orbitals band inversion at Γ point, whilst the band gap appears under the effect of spin-orbital coupling (SOC). The QSH phase of SiCH(3) is confirmed by the topological invariant Z(2) = 1, as well as helical edge states. The SiCH(3) supported by hexagonal boron nitride (BN) film makes it possible to observe its non-trivial topological phase experimentally, due to the weak interlayer interaction. The results of this work provide a new potential candidate for two-dimensional honeycomb lattice spintronic devices in spintronics. MDPI 2018-09-07 /pmc/articles/PMC6163979/ /pubmed/30205466 http://dx.doi.org/10.3390/nano8090698 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ren, Ceng-Ceng
Ji, Wei-Xiao
Zhang, Shu-Feng
Zhang, Chang-Wen
Li, Ping
Wang, Pei-Ji
Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3)
title Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3)
title_full Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3)
title_fullStr Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3)
title_full_unstemmed Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3)
title_short Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH(3)
title_sort strain-induced quantum spin hall effect in two-dimensional methyl-functionalized silicene sich(3)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163979/
https://www.ncbi.nlm.nih.gov/pubmed/30205466
http://dx.doi.org/10.3390/nano8090698
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