Time evolution of nonequilibrium photoexcited plasma in polar semiconductors

Abstract

The nonequilibrium thermodynamics and kinetics of evolution of relaxation processes in polar semiconductors under high levels of optical excitation is studied. This is done using a first-principles theory that allows for the determination of the nonlinear transport equations which describe the irreversible processes that develop in the media in typical pump-probe experiments. Numerical calculations are presented which permit a comprehensive discussion of measurements of ultrafast-time-resolved optical spectra of GaAs.