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TT: Fachverband Tiefe Temperaturen

TT 23: Nanoelectronics II - Spintronics and Magnetotransport

TT 23.1: Talk

Thursday, March 29, 2007, 09:30–09:45, H19

Spin-density in a two-dimensional electron gas induced by an electromagnetic wave — •Alexander Shnirman¹ and Ivar Martin² — ¹Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany. — ²Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

We consider the magnetic response of a two-dimensional electron gas (2DEG) with a spin-orbit interaction to a long-wave-length electromagnetic excitation. We observe that the transverse electric field creates a spin polarization perpendicular to the 2DEG plane. The effect is more prominent in clean systems with resolved spin-orbit-split subbands, and reaches maximum when the frequency of the wave matches the subband splitting at the Fermi momentum. The relation of this effect to the spin-Hall effect is discussed.