Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures

Abstract The main contribution of this paper is to study the spin caloritronic effects in defected graphene/silicene nanoribbon (GSNR) junctions. Each step-like GSNR is subjected to the ferromagnetic exchange and local external electric fields, and their responses are determined using the nonequilib...

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Autores principales:	Zainab Gholami, Farhad Khoeini
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c853e63e52f44cc9a60453eab4c73c03
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spelling	oai:doaj.org-article:c853e63e52f44cc9a60453eab4c73c032021-12-02T18:47:07ZVacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures10.1038/s41598-021-94842-w2045-2322https://doaj.org/article/c853e63e52f44cc9a60453eab4c73c032021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94842-whttps://doaj.org/toc/2045-2322Abstract The main contribution of this paper is to study the spin caloritronic effects in defected graphene/silicene nanoribbon (GSNR) junctions. Each step-like GSNR is subjected to the ferromagnetic exchange and local external electric fields, and their responses are determined using the nonequilibrium Green’s function (NEGF) approach. To further study the thermoelectric (TE) properties of the GSNRs, three defect arrangements of divacancies (DVs) are also considered for a larger system, and their responses are re-evaluated. The results demonstrate that the defected GSNRs with the DVs can provide an almost perfect thermal spin filtering effect (SFE), and spin switching. A negative differential thermoelectric resistance (NDTR) effect and high spin polarization efficiency (SPE) larger than 99.99% are obtained. The system with the DV defects can show a large spin-dependent Seebeck coefficient, equal to S s ⁓ 1.2 mV/K, which is relatively large and acceptable. Appropriate thermal and electronic properties of the GSNRs can also be obtained by tuning up the DV orientation in the device region. Accordingly, the step-like GSNRs can be employed to produce high efficiency spin caloritronic devices with various features in practical applications.Zainab GholamiFarhad KhoeiniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zainab Gholami Farhad Khoeini Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
description	Abstract The main contribution of this paper is to study the spin caloritronic effects in defected graphene/silicene nanoribbon (GSNR) junctions. Each step-like GSNR is subjected to the ferromagnetic exchange and local external electric fields, and their responses are determined using the nonequilibrium Green’s function (NEGF) approach. To further study the thermoelectric (TE) properties of the GSNRs, three defect arrangements of divacancies (DVs) are also considered for a larger system, and their responses are re-evaluated. The results demonstrate that the defected GSNRs with the DVs can provide an almost perfect thermal spin filtering effect (SFE), and spin switching. A negative differential thermoelectric resistance (NDTR) effect and high spin polarization efficiency (SPE) larger than 99.99% are obtained. The system with the DV defects can show a large spin-dependent Seebeck coefficient, equal to S s ⁓ 1.2 mV/K, which is relatively large and acceptable. Appropriate thermal and electronic properties of the GSNRs can also be obtained by tuning up the DV orientation in the device region. Accordingly, the step-like GSNRs can be employed to produce high efficiency spin caloritronic devices with various features in practical applications.
format	article
author	Zainab Gholami Farhad Khoeini
author_facet	Zainab Gholami Farhad Khoeini
author_sort	Zainab Gholami
title	Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
title_short	Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
title_full	Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
title_fullStr	Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
title_full_unstemmed	Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
title_sort	vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c853e63e52f44cc9a60453eab4c73c03
work_keys_str_mv	AT zainabgholami vacancytunedthermoelectricpropertiesandhighspinfilteringperformanceingraphenesiliceneheterostructures AT farhadkhoeini vacancytunedthermoelectricpropertiesandhighspinfilteringperformanceingraphenesiliceneheterostructures
_version_	1718377705711337472

Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures

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