Photon-assisted spin transport in a two-dimensional electron gas

Abstract

We study spin-dependent transport in a two-dimensional electron gas subject to an external step-like potential $V(x)$ and irradiated by an electromagnetic field (EF). In the absence of EF the electronic spectrum splits into spin sub-bands originating from the "Rashba" spin-orbit coupling. We show that the resonant interaction of propagating electrons with the component EF parallel to the barrier induces a \textit{% non-equilibrium dynamic gap} $(2{\Delta }_R)$ between the spin sub-bands. Existence of this gap results in coherent spin-flip processes that lead to a spin-polarized current and a large magnetoresistance, i.e the spin valve effect. These effects may be used for controlling spin transport in semiconducting nanostructures, e.g. spin transistors, spin-blockade devices etc., by variation of the intensity S and frequency $\omega$ of the external radiation.

extended version accepted in the Physical Review B, corrected typos, 5 pages, 3 new figures

References in corpus (3)

• Spin polarization of electrons by non-magnetic heterostructures : basics of spin-optics
• Electromagnetic field induced suppression of transport through $n$-$p$ junctions in graphene
• Polarized Electric Current in Semiclassical Transport with Spin-Orbit Interaction

Cited by in corpus (1)

• Effect of radiation on transport in graphene