Abstract
A high degree (≈55%) of circular polarization has been observed for the neutral exciton in InAs/GaAs quantumdots (QDs). The possibility to record non-zero polarization of the neutral exciton isexplained in terms of different capture times of the light electron compared with theheavier holes into the QDs from the wetting layer. This interpretation is supported by theprogressive reduction of the polarization degree with increasing QD density, and also withincreasing temperature.
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