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We investigate the optical dephasing of photoexcited excitons in two differentZnSe x Se 1-x layer structures by means of time-integrated four-wave mixing using subpicosecond pulses. We find dephasing times of the order of 0.5 ps for the exciton ground state at 9 K. The dephasing time shows a dependence on the excitation intensity due to exciton-exciton scattering. Simultaneous...
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