Physics – Condensed Matter – Materials Science
Scientific paper
2006-12-27
Physics
Condensed Matter
Materials Science
5 pages, 4 figures, Submitted to JETP Letters
Scientific paper
We report on both experimental and theoretical study of conduction-electron spin polarization dynamics achieved by pulsed optical pumping at room temperature in GaAs(1-x)N(x) alloys with a small nitrogen content (x = 2.1, 2.7, 3.4%). It is found that the photoluminescence circular polarization determined by the mean spin of free electrons reaches 40-45% and this giant value persists within 2 ns. Simultaneously, the total free-electron spin decays rapidly with the characteristic time ~150 ps. The results are explained by spin-dependent capture of free conduction electrons on deep paramagnetic centers resulting in dynamical polarization of bound electrons. We have developed a nonlinear theory of spin dynamics in the coupled system of spin-polarized free and localized carriers which describes the experimental dependencies, in particular, electron spin quantum beats observed in a transverse magnetic field.
Amand Thierry
Egorov Yu. A.
Ivchenko Eougenious L.
Kalevich V. K.
Lagarde D.
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