Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure

Abstract Valleytronics is receiving extensive research efforts. Thus, we investigated the electric field-induced valley polarization in the WSe2/CrSnSe3 heterostructures by varying the stacking order. The heterostructure shows indirect band gaps of 270 and 330 meV in the two most stable structures....

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Autores principales:	Imran Khan, Brahim Marfoua, Jisang Hong
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/95dd76a31ded4f9d8f46c7821ee79278
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spelling	oai:doaj.org-article:95dd76a31ded4f9d8f46c7821ee792782021-12-02T13:35:39ZElectric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure10.1038/s41699-020-00195-92397-7132https://doaj.org/article/95dd76a31ded4f9d8f46c7821ee792782021-01-01T00:00:00Zhttps://doi.org/10.1038/s41699-020-00195-9https://doaj.org/toc/2397-7132Abstract Valleytronics is receiving extensive research efforts. Thus, we investigated the electric field-induced valley polarization in the WSe2/CrSnSe3 heterostructures by varying the stacking order. The heterostructure shows indirect band gaps of 270 and 330 meV in the two most stable structures. The WSe2/CrSnSe3 heterostructure displays a ferromagnetic ground state with out-of-plane anisotropy (0.02 meV) in one stable stacking (S-1) while a small in-plane anisotropy (−0.01 meV) is found in other stacking (S-2). The Curie temperature is slightly enhanced to 73 K compared to the monolayer CrSnSe3. We have found the valley splitting of 4 meV in S-1 whereas it became 9 meV in the S-2 system. The valley splitting is further enhanced if an electric field is applied from CrSnSe3 to the WSe2 layer whereas it is suppressed in the reversed electric field. Particularly, the S-2 structure shows a giant valley splitting of 67 meV at an electric field of 0.6 V Å−1. We attribute this electric field-dependency to the dipolar effect. Overall, we propose that the WSe2/CrSnSe3 heterostructure can be a potential structure for obtaining a giant valley splitting.Imran KhanBrahim MarfouaJisang HongNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-8 (2021)
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 Imran Khan Brahim Marfoua Jisang Hong Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure
description	Abstract Valleytronics is receiving extensive research efforts. Thus, we investigated the electric field-induced valley polarization in the WSe2/CrSnSe3 heterostructures by varying the stacking order. The heterostructure shows indirect band gaps of 270 and 330 meV in the two most stable structures. The WSe2/CrSnSe3 heterostructure displays a ferromagnetic ground state with out-of-plane anisotropy (0.02 meV) in one stable stacking (S-1) while a small in-plane anisotropy (−0.01 meV) is found in other stacking (S-2). The Curie temperature is slightly enhanced to 73 K compared to the monolayer CrSnSe3. We have found the valley splitting of 4 meV in S-1 whereas it became 9 meV in the S-2 system. The valley splitting is further enhanced if an electric field is applied from CrSnSe3 to the WSe2 layer whereas it is suppressed in the reversed electric field. Particularly, the S-2 structure shows a giant valley splitting of 67 meV at an electric field of 0.6 V Å−1. We attribute this electric field-dependency to the dipolar effect. Overall, we propose that the WSe2/CrSnSe3 heterostructure can be a potential structure for obtaining a giant valley splitting.
format	article
author	Imran Khan Brahim Marfoua Jisang Hong
author_facet	Imran Khan Brahim Marfoua Jisang Hong
author_sort	Imran Khan
title	Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure
title_short	Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure
title_full	Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure
title_fullStr	Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure
title_full_unstemmed	Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure
title_sort	electric field induced giant valley polarization in two dimensional ferromagnetic wse2/crsnse3 heterostructure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/95dd76a31ded4f9d8f46c7821ee79278
work_keys_str_mv	AT imrankhan electricfieldinducedgiantvalleypolarizationintwodimensionalferromagneticwse2crsnse3heterostructure AT brahimmarfoua electricfieldinducedgiantvalleypolarizationintwodimensionalferromagneticwse2crsnse3heterostructure AT jisanghong electricfieldinducedgiantvalleypolarizationintwodimensionalferromagneticwse2crsnse3heterostructure
_version_	1718392688576823296

Electric field induced giant valley polarization in two dimensional ferromagnetic WSe2/CrSnSe3 heterostructure

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