Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2

Abstract Recently, it has been known that the hidden Rashba (R-2) effect in two-dimensional materials gives rise to a physical phenomenon called spin-layer locking (SLL). However, not only its underlying fundamental mechanism has been unclear, but also there are only a few materials exhibiting weak...

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Autores principales:	Seungjun Lee, Young-Kyun Kwon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/fae708e6a6a643f0bad5f34ed3e72b7e
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spelling	oai:doaj.org-article:fae708e6a6a643f0bad5f34ed3e72b7e2021-12-02T14:17:38ZUnveiling giant hidden Rashba effects in two-dimensional Si2Bi210.1038/s41699-020-00180-22397-7132https://doaj.org/article/fae708e6a6a643f0bad5f34ed3e72b7e2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41699-020-00180-2https://doaj.org/toc/2397-7132Abstract Recently, it has been known that the hidden Rashba (R-2) effect in two-dimensional materials gives rise to a physical phenomenon called spin-layer locking (SLL). However, not only its underlying fundamental mechanism has been unclear, but also there are only a few materials exhibiting weak SLL. Here, through the first-principles density functional theory and model Hamiltonian calculation, we reveal that the R-2 SLL can be determined by the competition between the sublayer–sublayer interaction and the spin–orbit coupling, which is related to the Rashba strength. In addition, the orbital angular momentum distribution is another crucial point to realize the strong R-2 SLL. We propose that a 2D material Si2Bi2 possesses an ideal condition for the strong R-2 SLL, whose Rashba strength is evaluated to be 2.16 eVÅ, which is the greatest value ever observed in 2D R-2 materials to the best of our knowledge. Furthermore, we reveal that the interlayer interaction in a bilayer structure ensures R-2 states spatially farther apart, implying a potential application in spintronics.Seungjun LeeYoung-Kyun KwonNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 4, Iss 1, Pp 1-7 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999 Seungjun Lee Young-Kyun Kwon Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2
description	Abstract Recently, it has been known that the hidden Rashba (R-2) effect in two-dimensional materials gives rise to a physical phenomenon called spin-layer locking (SLL). However, not only its underlying fundamental mechanism has been unclear, but also there are only a few materials exhibiting weak SLL. Here, through the first-principles density functional theory and model Hamiltonian calculation, we reveal that the R-2 SLL can be determined by the competition between the sublayer–sublayer interaction and the spin–orbit coupling, which is related to the Rashba strength. In addition, the orbital angular momentum distribution is another crucial point to realize the strong R-2 SLL. We propose that a 2D material Si2Bi2 possesses an ideal condition for the strong R-2 SLL, whose Rashba strength is evaluated to be 2.16 eVÅ, which is the greatest value ever observed in 2D R-2 materials to the best of our knowledge. Furthermore, we reveal that the interlayer interaction in a bilayer structure ensures R-2 states spatially farther apart, implying a potential application in spintronics.
format	article
author	Seungjun Lee Young-Kyun Kwon
author_facet	Seungjun Lee Young-Kyun Kwon
author_sort	Seungjun Lee
title	Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2
title_short	Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2
title_full	Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2
title_fullStr	Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2
title_full_unstemmed	Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2
title_sort	unveiling giant hidden rashba effects in two-dimensional si2bi2
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/fae708e6a6a643f0bad5f34ed3e72b7e
work_keys_str_mv	AT seungjunlee unveilinggianthiddenrashbaeffectsintwodimensionalsi2bi2 AT youngkyunkwon unveilinggianthiddenrashbaeffectsintwodimensionalsi2bi2
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Unveiling giant hidden Rashba effects in two-dimensional Si2Bi2

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