Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Focus Session "Spin Currents in Magnetic Nanostructures", Organization: Mathias Kläui (Univ. Mainz)
MA 30.10: Talk
Wednesday, March 28, 2012, 18:30–18:45, EB 301
Light-induced spin pumping in two-dimensional electron systems with random Rashba spin-orbit interaction — •Vitalii Dugaev1,2, Michal Inglot2, Evgeny Sherman3, Jamal Berakdar1, and Jozef Barnas4 — 1Martin-Luther-Universität Halle-Wittenberg, Halle, Deutschland — 2Rzeszow University of Technology, Rzeszow, Poland — 3Universidad del Pais Vasco, Bilbao, Spain — 4Adam Mickiewicz University, Poznan, Poland
Rashba spin-orbit interaction plays an important role in two-dimensional electron systems leading to numerous spin-dependent effects like spin relaxation or anomalous and spin Hall effects. In some cases, the Rashba interaction can be strongly fluctuating in space with zero average value. The most important examples are some symmetric sandwiched structures with semiconductor quantum wells. We consider several different two-dimensional systems with random Rashba interaction. Besides the simple model with a parabolic energy spectrum we also analyze the Dirac model of electrons in graphene. We show that in the case of free-standing graphene the main source of spin-orbit interaction is related to corrugated and rippled surface. Our calculations demonstrate that in all cases the electromagnetic radiation can be used to effectively generate charge and spin densities. The mechanism of spin polarization under electromagnetic radiation is related to fluctuations of Rashba spin-orbit interaction strongly coupled to the electromagnetic field. We believe that this effect of spin pumping can be used in spintronics applications for optically-controlled generation and manipulation of the spin currents.