Abstract
The cooling of a hot electron-hole plasma in In0.53Ga0.47As is studied by means of an analytical model. It is assumed that the carriers are thermalized at different effective temperatures and their distributions are of a Fermi-Dirac form from the shortest times. The energy-loss rates from the plasma due to coupling to transverse and longitudinal optical and acoustic phonon modes are included. Non-equilibrium phonon mode occupancy occurs, which decreases the cooling rate, but it proves necessary to incorporate Gamma to L intervalley scattering into the model in order to provide a realistic description of recent experimental results. From this study we infer a Gamma to L scattering time, at a lattice temperature of 4 K, of 500+or-100 fs, and a return time of 9+or-2 ps.
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