We performed cw‐photoluminescence (PL) measurements on a 15 nm wide p‐doped Al0.3Ga0.7As‐GaAs‐Al0.3Ga0.7As quantum well structure at low temperatures. By irradiating the sample with circularly polarized light and analyzing the degree of circular polarization of the PL signal, we found a significantly higher degree of spin polarization for charged excitons (trions) than for neutral excitons. Time‐resolved pump‐probe and Faraday‐rotation experiments give an additional information concerning the exciton and trion resonant photoexcitation.

Topics
Spintronics, Doping, Excitons, Quasiparticle, Faraday effect, Photoexcitations, Photoluminescence, Quantum wells
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© 2007 American Institute of Physics.
2007
American Institute of Physics
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