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• W2009779500 abstract "Abstract Picosecond time-resolved induced reflectivity measurements were performed in narrow well (∼4.2 nm) GaAs/Al 0.4 Ga 0.6 As multiple quantum well systems in order to investigate fast excitonic relaxation. In a wide-barrier sample, - corresponding to independent subbands in each quantum well - a single exponential decay of the induced reflectivity is observed at very low power levels, corresponding to the population decay of the lowest exciton (hh 1 -e 1 ). At higher excitation levels, a second, faster component appears, which is ascribed to exciton-exciton interactions. The amplitude of both components shows resonances at the energy of the lowest heavy and light hole exciton transitions. Comparison is made with induced transparency measurements on a back-etched specimen. In a thin barrier sample ( L B ∼4.2 nm) - in which the exciton states couple through the barriers - a short, energy dependent decay time is measured, for which correlation with the photoluminescence decay is not straightforward." @default.
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• W2009779500 date "1992-07-01" @default.
• W2009779500 modified "2023-10-01" @default.
• W2009779500 title "Exciton dynamics in GaAs/AlGaAs multiple quantum wells investigated by picosecond reflectivity and luminescence measurements" @default.
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• W2009779500 doi "https://doi.org/10.1016/0022-2313(92)90191-b" @default.
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