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Controllable spin polarization and spin filtering in a zigzag silicene nanoribbon
Iran University of Science and Technology, Iran.
Iran University of Science and Technology, Iran.
Imam Khomeini International University, Iran.
Iran University of Science and Technology, Iran.
2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 117, no 17, article id 173913Article in journal (Refereed) Published
Abstract [en]

Using non-equilibrium Green's function, we study the spin-dependent electron transport properties in a zigzag silicene nanoribbon. To produce and control spin polarization, it is assumed that two ferromagnetic strips are deposited on the both edges of the silicene nanoribbon and an electric field is perpendicularly applied to the nanoribbon plane. The spin polarization is studied for both parallel and anti-parallel configurations of exchange magnetic fields induced by the ferromagnetic strips. We find that complete spin polarization can take place in the presence of perpendicular electric field for anti-parallel configuration and the nanoribbon can work as a perfect spin filter. The spin direction of transmitted electrons can be easily changed from up to down and vice versa by reversing the electric field direction. For parallel configuration, perfect spin filtering can occur even in the absence of electric field. In this case, the spin direction can be changed by changing the electron energy. Finally, we investigate the effects of nonmagnetic Anderson disorder on spin dependent conductance and find that the perfect spin filtering properties of nanoribbon are destroyed by strong disorder, but the nanoribbon retains these properties in the presence of weak disorder.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 117, no 17, article id 173913
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-99764DOI: 10.1063/1.4919659OAI: oai:DiVA.org:lnu-99764DiVA, id: diva2:1513809
Available from: 2021-01-02 Created: 2021-01-02 Last updated: 2021-01-11Bibliographically approved

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Pournaghavi, Nezhat

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