Orbital angular momentum analysis for giant spin splitting in solids and nanostructures

Abstract Giant spin splitting (GSS) of electronic bands, which is several orders of magnitude greater than the standard Rashba effect has been observed in various systems including noble-metal surfaces and thin films of transition-metal dichalcogenides. Previous studies reported that orbital angular...

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Autores principales:	Sehoon Oh, Hyoung Joon Choi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bcdd57a75a4a4c2faf885610ae592afe
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spelling	oai:doaj.org-article:bcdd57a75a4a4c2faf885610ae592afe2021-12-02T12:32:41ZOrbital angular momentum analysis for giant spin splitting in solids and nanostructures10.1038/s41598-017-02032-42045-2322https://doaj.org/article/bcdd57a75a4a4c2faf885610ae592afe2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02032-4https://doaj.org/toc/2045-2322Abstract Giant spin splitting (GSS) of electronic bands, which is several orders of magnitude greater than the standard Rashba effect has been observed in various systems including noble-metal surfaces and thin films of transition-metal dichalcogenides. Previous studies reported that orbital angular momentum (OAM) is not quenched in some GSS materials and that the atomic spin-orbit interaction (SOI) generates spin splitting in some solid states via the interorbital hopping. Although the unquenched OAM may be closely related to the interorbital hopping, their relationship is hardly studied in the aspect of using the unquenched OAM as a control parameter of GSS. Here, we analyze OAM in GSS materials by using the interorbital-hopping mechanism and first-principles calculations. We report that the interatomic hopping between different-parity orbitals, which is generated by specific broken mirror symmetry, produces k-dependent OAM, resulting in valley-dependent GSS in WSe2 monolayer, Rashba-type GSS in Au (111) surface, and Dresselhaus-type GSS in bulk HgTe. We also demonstrate systematic control of OAM by pressure, external fields, and substrates, thereby controlling the spin splitting, and discuss the temperature dependence of OAM. Our results provide a simplified picture for systematic design and control of GSS materials.Sehoon OhHyoung Joon ChoiNature 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 Sehoon Oh Hyoung Joon Choi Orbital angular momentum analysis for giant spin splitting in solids and nanostructures
description	Abstract Giant spin splitting (GSS) of electronic bands, which is several orders of magnitude greater than the standard Rashba effect has been observed in various systems including noble-metal surfaces and thin films of transition-metal dichalcogenides. Previous studies reported that orbital angular momentum (OAM) is not quenched in some GSS materials and that the atomic spin-orbit interaction (SOI) generates spin splitting in some solid states via the interorbital hopping. Although the unquenched OAM may be closely related to the interorbital hopping, their relationship is hardly studied in the aspect of using the unquenched OAM as a control parameter of GSS. Here, we analyze OAM in GSS materials by using the interorbital-hopping mechanism and first-principles calculations. We report that the interatomic hopping between different-parity orbitals, which is generated by specific broken mirror symmetry, produces k-dependent OAM, resulting in valley-dependent GSS in WSe2 monolayer, Rashba-type GSS in Au (111) surface, and Dresselhaus-type GSS in bulk HgTe. We also demonstrate systematic control of OAM by pressure, external fields, and substrates, thereby controlling the spin splitting, and discuss the temperature dependence of OAM. Our results provide a simplified picture for systematic design and control of GSS materials.
format	article
author	Sehoon Oh Hyoung Joon Choi
author_facet	Sehoon Oh Hyoung Joon Choi
author_sort	Sehoon Oh
title	Orbital angular momentum analysis for giant spin splitting in solids and nanostructures
title_short	Orbital angular momentum analysis for giant spin splitting in solids and nanostructures
title_full	Orbital angular momentum analysis for giant spin splitting in solids and nanostructures
title_fullStr	Orbital angular momentum analysis for giant spin splitting in solids and nanostructures
title_full_unstemmed	Orbital angular momentum analysis for giant spin splitting in solids and nanostructures
title_sort	orbital angular momentum analysis for giant spin splitting in solids and nanostructures
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/bcdd57a75a4a4c2faf885610ae592afe
work_keys_str_mv	AT sehoonoh orbitalangularmomentumanalysisforgiantspinsplittinginsolidsandnanostructures AT hyoungjoonchoi orbitalangularmomentumanalysisforgiantspinsplittinginsolidsandnanostructures
_version_	1718394002046189568

Orbital angular momentum analysis for giant spin splitting in solids and nanostructures

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