Abstract
At low excitation intensities the transmission and luminescence spectra of high quality direct gap semiconductor quantum wells are dominated by exciton transitions. The dynamics of these excitons is characterized by different relaxation times like the phase coherence time T2 and the recombination lifetime τ. The recombination lifetime of such two-dimensional (2D) excitons as well as its variation with the quantum well thickness L2 and the temperature T has been studied extensively by means of time-resolved photolumiaescence.1 On the other hand much less information is available for the phase coherence time T2 and the corresponding homogeneous linewidth Γh of these excitons because of the more complicated methods needed to measure it.2 The phase coherence time T2 is sensitive to all interactions of the excitons and, therefore, phase relaxation normally appears on a much shorter time scale than recombination.
© 1988 Optical Society of America
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