Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis

Abstract A tight-binding (TB) Hamiltonian is derived for strained silicene from a multi-orbital basis. The derivation is based on the Slater–Koster coupling parameters between different orbitals across the silicene lattice and takes into account arbitrary distortion of the lattice under strain, as w...

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Autores principales:	Zhuo Bin Siu, Mansoor B. A. Jalil
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/55596fdc7dd14374856699508f1e0587
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spelling	oai:doaj.org-article:55596fdc7dd14374856699508f1e05872021-12-02T14:26:51ZEffective Hamiltonian for silicene under arbitrary strain from multi-orbital basis10.1038/s41598-021-86947-z2045-2322https://doaj.org/article/55596fdc7dd14374856699508f1e05872021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86947-zhttps://doaj.org/toc/2045-2322Abstract A tight-binding (TB) Hamiltonian is derived for strained silicene from a multi-orbital basis. The derivation is based on the Slater–Koster coupling parameters between different orbitals across the silicene lattice and takes into account arbitrary distortion of the lattice under strain, as well as the first and second-order spin–orbit interactions (SOI). The breaking of the lattice symmetry reveals additional SOI terms which were previously neglected. As an exemplary application, we apply the linearized low-energy TB Hamiltonian to model the current-induced spin accumulation in strained silicene coupled to an in-plane magnetization. The interplay between symmetry-breaking and the additional SOI terms induces an out-of-plane spin accumulation. This spin accumulation remains unbalanced after summing over the Fermi surfaces of the occupied bands and the two valleys, and can thus be utilized for spin torque switching.Zhuo Bin SiuMansoor B. A. JalilNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhuo Bin Siu Mansoor B. A. Jalil Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis
description	Abstract A tight-binding (TB) Hamiltonian is derived for strained silicene from a multi-orbital basis. The derivation is based on the Slater–Koster coupling parameters between different orbitals across the silicene lattice and takes into account arbitrary distortion of the lattice under strain, as well as the first and second-order spin–orbit interactions (SOI). The breaking of the lattice symmetry reveals additional SOI terms which were previously neglected. As an exemplary application, we apply the linearized low-energy TB Hamiltonian to model the current-induced spin accumulation in strained silicene coupled to an in-plane magnetization. The interplay between symmetry-breaking and the additional SOI terms induces an out-of-plane spin accumulation. This spin accumulation remains unbalanced after summing over the Fermi surfaces of the occupied bands and the two valleys, and can thus be utilized for spin torque switching.
format	article
author	Zhuo Bin Siu Mansoor B. A. Jalil
author_facet	Zhuo Bin Siu Mansoor B. A. Jalil
author_sort	Zhuo Bin Siu
title	Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis
title_short	Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis
title_full	Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis
title_fullStr	Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis
title_full_unstemmed	Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis
title_sort	effective hamiltonian for silicene under arbitrary strain from multi-orbital basis
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/55596fdc7dd14374856699508f1e0587
work_keys_str_mv	AT zhuobinsiu effectivehamiltonianforsiliceneunderarbitrarystrainfrommultiorbitalbasis AT mansoorbajalil effectivehamiltonianforsiliceneunderarbitrarystrainfrommultiorbitalbasis
_version_	1718391309254787072

Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis

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