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Semiconductor quantum wells (QWs) show enhanced excitonic behavior partly due to quantum confinement of carriers, resulting in well-resolved excitonic absorption peaks even at room temperature. Recent studies of femtosecond dynamics of excitonic absorption in GaAs[l] and InGaAs QWs[2] have revealed the fact that excitons produce more absorption bleaching than equal densities of free e-h pairs and good agreement between the homogeneous excitonic absorption linewidth broadening and the exciton ionization time at room temperature.
© 1991 Optical Society of America
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