Ukrainian Journal of Physical Optics

Spin polarization of dilute magnetic semiconductors under optical excitation of impurity levels
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Gorley P.M., Mysliuk O.M., Vieira M., Horley P.P., Dugaev V.K. and Barnas J.

We use the method based on kinetic equations to analyze the influence of inten-sity and polarization of incident light, concentration of impurities with unfilled 3d or 4f shells and long-term relaxation times of conduction electrons and mag-netic ions upon the degree of spin polarization. In case of spatially inhomogene-ous stationary states, the distribution of band electrons is shown to oscillate in space, with a transition to spatially homogeneous distribution for infinitely thick sample. It is also demonstrated that the maximum spin polarization degree h_e for the band electrons can be reached for the thickness of semiconductor film com-parable to the diffusion length for the minority carriers.

Keywords: optical excitation, spin polarization, spintronics, diluted magnetic semi-conductors

PACS: 72.25.Fe, 72.25.Rb, 72.25.-b, 78.20.Bh, 78.40.Fy
UDC: 535.568
Ukr. J. Phys. Opt. 9 60-71 doi: 10.3116/16091833/9/1/60/2008
Received: 18.12.2007

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(c) Ukrainian Journal of Physical Optics