Abstract
The coherence of an excitonic ensemble resonantly excited by an ultrashort pulse is probed by arranging an interaction with a second identical pulse in a time-resolved coherent control experiment. We demonstrate that the decay of the amplitude of coherent control is faster than exciton dephasing for low excitation density. We also study the rise and the decay of the secondary emission from quantum well systems and observe how both of them show a dominant contribution of resonant Rayleigh scattering.
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