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• W2051603077 abstract "The giant oscillator strength for radiative transitions of excitons in quantum wells is largely due to the macroscopic polarization of a two-dimensional system. At low temperatures the large oscillator strength leads to a short radiative lifetime of free excitons. We investigate the photoluminescence linewidths and lifetimes of free excitons in a series of extremely high-quality GaAs quantum wells as a function of lattice temperature, excitation intensity, and quantum-well width. With only negligible defect states in our quantum-well sample, we are able to correlate the time-resolved data with temperature-dependent linewidth measurements on the series of quantum wells to estimate the homogeneous linewidth and acoustic-phonon scattering rate of free excitons. Our studies show that thermalization of the excitonic states, ionization into free carriers, and a reduction in the coherence volume of the exciton polarization due to defect scattering, lead to a decrease in the net radiative recombination rate." @default.
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• W2051603077 date "1992-10-15" @default.
• W2051603077 modified "2023-10-16" @default.
• W2051603077 title "Intrinsic linewidths and radiative lifetimes of free excitons in GaAs quantum wells" @default.
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• W2051603077 doi "https://doi.org/10.1103/physrevb.46.10193" @default.
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