Non-equilibrium spin-current induced by random Rashba field

A semi-classical approach

¹ Department of Physics, Azarbaijan Shahid Madani University, 53714-161 Tabriz, Iran
² Plasma & Condensed Matter Computational Research Laboratory, Azarbaijan Shahid Madani University, 53714-161 Tabriz, Iran
³ Department of Physics, Peyam-e-noor University, 19395-4697 Tehran, Iran

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

Received: 29 June 2013
Revised: 2 November 2013
Accepted: 17 December 2013
Published online: 14 February 2014

Abstract

The influence of inhomogeneous Rashba interaction on spin-transport of two-dimensional electron gas system (2DEG) is investigated. In the works which have been previously performed in this field it has been shown that in the non-equilibrium regime, the Rashba and Dresselhaus couplings cannot be responsible for spin-current and both transverse and longitudinal components of the spin-current identically vanish. In the present work by using a semi-classical method it was found out that a random Rashba field interaction cannot be considered as a underestimate effect on spin-dependent mechanisms. Regarding the inhomogeneous distribution of the Rashba field it was shown that the spin-current of the system, in general, does not go all the way to zero.