Volume 78, Number 2, April 2007
Article Number 27001
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 21 March 2007
EPL, 78 (2007) 27001
DOI: 10.1209/0295-5075/78/27001

Spin-density induced by electromagnetic wave in two-dimensional electron gas

A. Shnirman1 and I. Martin2

1  Institut für Theoretische Festkörperphysik, Universität Karlsruhe - D-76128 Karlsruhe, Germany
2  Theoretical Division, Los Alamos National Laboratory - Los Alamos, NM 87545, USA

received 1 November 2006; accepted in final form 22 February 2007; published April 2007
published online 21 March 2007

We consider the magnetic response of a two-dimensional electron gas (2DEG) with a spin-orbit interaction to a long-wavelength electromagnetic excitation. We observe that the transverse electric field creates 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.

72.25.Rb - Spin relaxation and scattering.
85.75.-d - Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields.

© Europhysics Letters Association 2007