Abstract
Spin-dependent recombination is observed in Ga 0.6Al 0.4As at 77°K on the intensity of the donor-acceptor pairs photoluminescence. The lifetime is enhanced by a factor 2.3 when photocreated electrons and recombination centers are spin polarized by optical pumping with circularly polarized light. Optical orientation and spin-dependent recombination lead to a steady-state electronic spin polarization as large as 70%.
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