Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene

Abstract Using first-principles calculations, we investigate the possibility of realizing valley Hall effects (VHE) in blistered graphene sheets. We show that the Van Hove singularities (VHS) induced by structural deformations can give rise to interesting spin–valley Hall phenomena. The broken degen...

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Autores principales:	M. Umar Farooq, Arqum Hashmi, Tomoya Ono, Li Huang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
Acceso en línea:	https://doaj.org/article/e8e24632c09f40068ce96adc90527127
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spelling	oai:doaj.org-article:e8e24632c09f40068ce96adc905271272021-12-02T13:33:28ZSpin–valley Hall phenomena driven by Van Hove singularities in blistered graphene10.1038/s41524-020-00470-92057-3960https://doaj.org/article/e8e24632c09f40068ce96adc905271272020-12-01T00:00:00Zhttps://doi.org/10.1038/s41524-020-00470-9https://doaj.org/toc/2057-3960Abstract Using first-principles calculations, we investigate the possibility of realizing valley Hall effects (VHE) in blistered graphene sheets. We show that the Van Hove singularities (VHS) induced by structural deformations can give rise to interesting spin–valley Hall phenomena. The broken degeneracy of spin degree of freedom results in spin-filtered VH states and the valley conductivity have a Hall plateau of ±e2/2h, while the blistered structures with time-reversal symmetry show the VHE with the opposite sign of $$\sigma _{xy}^{K/K^{\prime}}$$ σ x y K / K ′ (e2/2h) in the two valleys. Remarkably, these results show that the distinguishable chiral valley pseudospin state can occur even in the presence of VHS induced spin splitting. The robust chiral spin–momentum textures in both massless and massive Dirac cones of the blistered systems indicate significant suppression of carrier back-scattering. Our study provides a different approach to realize spin-filtered and spin-valley contrasting Hall effects in graphene-based devices without any external field.M. Umar FarooqArqum HashmiTomoya OnoLi HuangNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Computer softwareQA76.75-76.765ENnpj Computational Materials, Vol 6, Iss 1, Pp 1-8 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765 M. Umar Farooq Arqum Hashmi Tomoya Ono Li Huang Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene
description	Abstract Using first-principles calculations, we investigate the possibility of realizing valley Hall effects (VHE) in blistered graphene sheets. We show that the Van Hove singularities (VHS) induced by structural deformations can give rise to interesting spin–valley Hall phenomena. The broken degeneracy of spin degree of freedom results in spin-filtered VH states and the valley conductivity have a Hall plateau of ±e2/2h, while the blistered structures with time-reversal symmetry show the VHE with the opposite sign of $$\sigma _{xy}^{K/K^{\prime}}$$ σ x y K / K ′ (e2/2h) in the two valleys. Remarkably, these results show that the distinguishable chiral valley pseudospin state can occur even in the presence of VHS induced spin splitting. The robust chiral spin–momentum textures in both massless and massive Dirac cones of the blistered systems indicate significant suppression of carrier back-scattering. Our study provides a different approach to realize spin-filtered and spin-valley contrasting Hall effects in graphene-based devices without any external field.
format	article
author	M. Umar Farooq Arqum Hashmi Tomoya Ono Li Huang
author_facet	M. Umar Farooq Arqum Hashmi Tomoya Ono Li Huang
author_sort	M. Umar Farooq
title	Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene
title_short	Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene
title_full	Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene
title_fullStr	Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene
title_full_unstemmed	Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene
title_sort	spin–valley hall phenomena driven by van hove singularities in blistered graphene
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/e8e24632c09f40068ce96adc90527127
work_keys_str_mv	AT mumarfarooq spinvalleyhallphenomenadrivenbyvanhovesingularitiesinblisteredgraphene AT arqumhashmi spinvalleyhallphenomenadrivenbyvanhovesingularitiesinblisteredgraphene AT tomoyaono spinvalleyhallphenomenadrivenbyvanhovesingularitiesinblisteredgraphene AT lihuang spinvalleyhallphenomenadrivenbyvanhovesingularitiesinblisteredgraphene
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Spin–valley Hall phenomena driven by Van Hove singularities in blistered graphene

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