Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-08-27
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
22 pages, 8 figures, submitted to Journal of Physics: Condensed Matter
Scientific paper
We present a systematic theoretical study of spin-dependent recombination and its effect on optical orientation of photoelectron spins in semiconductors with deep paramagnetic centers. For this aim we generalize the Shockley-Read theory of recombination of electrons and holes through the deep centers with allowance for optically-induced spin polarization of free and bound electrons. Starting from consideration of defects with three charge states we turn to the two-charge-state model possessing nine parameters and show that it is compatible with available experimental data on undoped GaAsN alloys. In the weak- and strong-pumping limits, we derive simple analytic equations which are useful in prediction and interpretation of experimental results. Experimental and theoretical dependencies of the spin-dependent-recombination ratio and degree of photoluminescence circular polarization on the pumping intensity and the transverse magnetic field are compared and discussed.
Afanasiev M. M.
Ivchenko Eougenious L.
Kalevich V. K.
Masumoto Yasuaki
Shiryaev Yu. A.
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