Abstract
The optical dephasing of 2D excitons in GaAs single quantum wells is studied by means of time-resolved Degenerate Four-Wave Mixing and transmission spectroscopy. The measured phase coherence time directly corresponds to the absorption line-width confirming the homogeneous nature of the line broadening. The observed linear temperature dependence of the homogeneous linewidth below 80K reveals acoustic-phonon scattering as the dominant optical dephasing process.
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