Núñez, C., Domínguez-Adame, F., Orellana, P. A., Rosales, L. and Römer, Rudolf A. (2016) Silicene-based spin-filter device : impact of random vacancies. 2D Materials, 3 (2). ISSN 2053-1583.

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Abstract

We propose a hybrid spin-filter device based on a silicene nanoribbon. A ferroelectric polymer grown on top of the nanoribbon splits spin-up and spin-down electron bands and gives rise to spin polarisation of the conductance. In particular, we study the effects of a random distribution of vacancies on the performance of this spin-filter device. Disorder induces Anderson localisation of electrons and we find that the localisation length strongly depends on the electron spin. By adjusting the Fermi level of the source contact, only electrons with one spin orientation can reach the drain contact because their localisation length is larger than the length of the device. Electrons with opposite spin are largely back-reflected. Electric conductance then becomes spin polarised and the device behaves as a quasi-half-metal. We conclude that a moderate concentration of vacancies has little impact on the spin-filter capabilities of the device, opening the possibility to using it as a tuneable source of polarized electrons.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics Faculty of Science, Engineering and Medicine > Science > Centre for Scientific Computing
Library of Congress Subject Headings (LCSH):	Nanotechnology , Spintronics, Ferroelectricity, Anderson model
Journal or Publication Title:	2D Materials
Publisher:	IOP Publishing
ISSN:	2053-1583
Official Date:	30 March 2016
Dates:	Date Event 30 March 2016 Published 17 February 2016 Accepted 4 November 2015 Submitted
Volume:	3
Number:	2
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	29 March 2016
Date of first compliant Open Access:	30 March 2017
Funder:	Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Engineering and Physical Sciences Research Council (EPSRC)
Grant number:	MAT201346308 (MINECO), 140388, 1140571 (FONDECYT), ACT 1204 (CONICYT), P/J003476/1, EP/K000128/1 (EPSRC)

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