Excitation induced dephasing in four-wave mixing and Coulomb quantum kinetics

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.