Volume 78, Number 2, April 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 March 2007|
Spin-density induced by electromagnetic wave in two-dimensional electron gas
Institut für Theoretische Festkörperphysik, Universität Karlsruhe - D-76128 Karlsruhe, Germany
2 Theoretical Division, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
Accepted: 22 February 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.
PACS: 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
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