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arXiv · 0707.4571

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

M. V. Fistul·K. B. Efetov
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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} $(2Δ_{R})$ 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 $ω$ of the external radiation.

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M. V. Fistul, K. B. Efetov. 2007-11-05. Photon-assisted spin transport in a two-dimensional electron gas. https://doi.org/10.1103/physrevb.76.195329

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