Eur. Phys. J. B (2014) 87: 95
https://doi.org/10.1140/epjb/e2014-40613-8

Regular Article

The role of the Rashba coupling in spin-current of monolayer gapped graphene

¹ Department of Physics, Azarbaijan Shahid Madani University, 53714-161 Tabriz, Iran
² Condensed Matter Computational Research Lab., Azarbaijan Shahid Madani University, 53714-161 Tabriz, Iran

^a e-mail: Phirouznia@azaruniv.ac.ir

Received: 25 June 2013
Received in final form: 27 December 2013
Published online: 23 April 2014

Abstract

In the current work, based on a semiclassical Boltzmann approach, we have investigated the influence of the Rashba spin-orbit coupling on spin-current of a single layer gapped graphene. It was shown that the Rashba coupling plays a considerable role in the generation of the spin-current of vertical spins in mono-layer graphene. The behavior of the spin-current is determined by the density of impurities. It was also shown that the spin-current of the system could increase by increasing the Rashba coupling strength and band-gap of the graphene and the sign of the spin-current could be controlled by the direction of the current-driving electric field.