Abstract
We show that former discrepancies between LO-phonon quantum-kinetic calculations and experimental four-wave-mixing signals at early time delays and moderate pair densities at $n=1.8\ifmmode\times\else\texttimes\fi{}{10}^{16}{\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$ in GaAs, which could only be fitted by introducing an additional density-dependent dephasing time, are eliminated by adding the recently developed quantum kinetics of time-dependent screened carrier-carrier scattering.
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