Helical edge states and edge-state transport in strained armchair graphene nanoribbons

Abstract A helical type edge state, which is generally supported only on graphene with zigzag boundaries, is found to also appear in armchair graphene nanoribbons in the presence of intrinsic spin-orbit coupling and a suitable strain. At a critical strain, there appears a quantum phase transition fr...

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Auteurs principaux:	Zheng-Fang Liu, Qing-Ping Wu, Ai-Xi Chen, Xian-Bo Xiao, Nian-Hua Liu, Guo-Xing Miao
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2017
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/76fdce77ad384ab5b7c6b51bb898ec33
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spelling	oai:doaj.org-article:76fdce77ad384ab5b7c6b51bb898ec332021-12-02T16:06:21ZHelical edge states and edge-state transport in strained armchair graphene nanoribbons10.1038/s41598-017-08954-32045-2322https://doaj.org/article/76fdce77ad384ab5b7c6b51bb898ec332017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08954-3https://doaj.org/toc/2045-2322Abstract A helical type edge state, which is generally supported only on graphene with zigzag boundaries, is found to also appear in armchair graphene nanoribbons in the presence of intrinsic spin-orbit coupling and a suitable strain. At a critical strain, there appears a quantum phase transition from a quantum spin Hall state to a trivial insulator state. Further investigation shows that the armchair graphene nanoribbons with intrinsic spin-orbit coupling, Rashba spin-orbit coupling, effective exchange fields and strains also support helical-like edge states with a unique spin texture. In such armchair graphene nanoribbons, the spin directions of the counterpropogating edge states on the same boundary are always opposite to each other, while is not conserved and the spins are canted away from the -direction due to the Rashba spin-orbit coupling, which is different from the case of the zigzag graphene nanoribbons. Moreover, the edge-state energy gap is smaller than that in zigzag graphene nanoribbons, even absent in certain cases.Zheng-Fang LiuQing-Ping WuAi-Xi ChenXian-Bo XiaoNian-Hua LiuGuo-Xing MiaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zheng-Fang Liu Qing-Ping Wu Ai-Xi Chen Xian-Bo Xiao Nian-Hua Liu Guo-Xing Miao Helical edge states and edge-state transport in strained armchair graphene nanoribbons
description	Abstract A helical type edge state, which is generally supported only on graphene with zigzag boundaries, is found to also appear in armchair graphene nanoribbons in the presence of intrinsic spin-orbit coupling and a suitable strain. At a critical strain, there appears a quantum phase transition from a quantum spin Hall state to a trivial insulator state. Further investigation shows that the armchair graphene nanoribbons with intrinsic spin-orbit coupling, Rashba spin-orbit coupling, effective exchange fields and strains also support helical-like edge states with a unique spin texture. In such armchair graphene nanoribbons, the spin directions of the counterpropogating edge states on the same boundary are always opposite to each other, while is not conserved and the spins are canted away from the -direction due to the Rashba spin-orbit coupling, which is different from the case of the zigzag graphene nanoribbons. Moreover, the edge-state energy gap is smaller than that in zigzag graphene nanoribbons, even absent in certain cases.
format	article
author	Zheng-Fang Liu Qing-Ping Wu Ai-Xi Chen Xian-Bo Xiao Nian-Hua Liu Guo-Xing Miao
author_facet	Zheng-Fang Liu Qing-Ping Wu Ai-Xi Chen Xian-Bo Xiao Nian-Hua Liu Guo-Xing Miao
author_sort	Zheng-Fang Liu
title	Helical edge states and edge-state transport in strained armchair graphene nanoribbons
title_short	Helical edge states and edge-state transport in strained armchair graphene nanoribbons
title_full	Helical edge states and edge-state transport in strained armchair graphene nanoribbons
title_fullStr	Helical edge states and edge-state transport in strained armchair graphene nanoribbons
title_full_unstemmed	Helical edge states and edge-state transport in strained armchair graphene nanoribbons
title_sort	helical edge states and edge-state transport in strained armchair graphene nanoribbons
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/76fdce77ad384ab5b7c6b51bb898ec33
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_version_	1718385032502968320

Helical edge states and edge-state transport in strained armchair graphene nanoribbons

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