Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene

Abstract The role of staggered potential on light-induced spin and pseudo-spin polarization has been investigated in silicene. It has been shown that non-equilibrium spin and pseudo-spin polarizations are emerged in silicene sheet by applying an external perpendicular electric field in the presence...

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Autores principales:	N. Shahabi, A. Phirouznia
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a1b3c5c28c3a4580a91c9d7d777f67bc
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spelling	oai:doaj.org-article:a1b3c5c28c3a4580a91c9d7d777f67bc2021-12-02T18:37:07ZNormal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene10.1038/s41598-020-73138-52045-2322https://doaj.org/article/a1b3c5c28c3a4580a91c9d7d777f67bc2020-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-73138-5https://doaj.org/toc/2045-2322Abstract The role of staggered potential on light-induced spin and pseudo-spin polarization has been investigated in silicene. It has been shown that non-equilibrium spin and pseudo-spin polarizations are emerged in silicene sheet by applying an external perpendicular electric field in the presence of circularly polarized light emission. This electric field results in pseudo-spin resolved states very close to the Dirac points therefore could be considered as a pseudomagnetic field. It has been shown that staggered potential induced spin-valley locking and pseudo-spin resolved bands are responsible for the enhancement of the spin and pseudo-spin polarizations. Meanwhile, spin-valley locking suggests a coexistence of both spin and valley polarizations with nearly identical (or at least proportional) population imbalance at low Fermi energies which could be employed for magnetic detection of the valley polarization. It has been shown that spin-valley locking results in the protection of the spin polarizations against the relaxations in elastic scattering regime. In addition, the results indicate that the pseudo-spin current can be generated by the circularly polarized light which could be explained by asymmetric light absorption of the states in k-space.N. ShahabiA. PhirouzniaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-11 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q N. Shahabi A. Phirouznia Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene
description	Abstract The role of staggered potential on light-induced spin and pseudo-spin polarization has been investigated in silicene. It has been shown that non-equilibrium spin and pseudo-spin polarizations are emerged in silicene sheet by applying an external perpendicular electric field in the presence of circularly polarized light emission. This electric field results in pseudo-spin resolved states very close to the Dirac points therefore could be considered as a pseudomagnetic field. It has been shown that staggered potential induced spin-valley locking and pseudo-spin resolved bands are responsible for the enhancement of the spin and pseudo-spin polarizations. Meanwhile, spin-valley locking suggests a coexistence of both spin and valley polarizations with nearly identical (or at least proportional) population imbalance at low Fermi energies which could be employed for magnetic detection of the valley polarization. It has been shown that spin-valley locking results in the protection of the spin polarizations against the relaxations in elastic scattering regime. In addition, the results indicate that the pseudo-spin current can be generated by the circularly polarized light which could be explained by asymmetric light absorption of the states in k-space.
format	article
author	N. Shahabi A. Phirouznia
author_facet	N. Shahabi A. Phirouznia
author_sort	N. Shahabi
title	Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene
title_short	Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene
title_full	Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene
title_fullStr	Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene
title_full_unstemmed	Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene
title_sort	normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/a1b3c5c28c3a4580a91c9d7d777f67bc
work_keys_str_mv	AT nshahabi normalelectricfieldenhancedlightinducedpolarizationsandmagneticdetectionofvalleypolarizationinsilicene AT aphirouznia normalelectricfieldenhancedlightinducedpolarizationsandmagneticdetectionofvalleypolarizationinsilicene
_version_	1718377816869830656

Normal electric field enhanced light-induced polarizations and magnetic detection of valley polarization in silicene

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