We investigate the temporal evolution and the density dependence of exciton bleaching in GaAs/Alₓ{Ga}_{1{{-}}x}$As quantum wells. We find that the carrier-induced reduction of exciton oscillator strength is not influenced by carrier cooling after creation of hot carriers with femtosecond laser pulses. Excitation density experiments suggest that either phase-space filling or Coulomb screening dominates the exciton bleaching, depending on the carrier density.
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Hunsche et al. (1994) studied this question.
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