Abstract
Differential transmission measurements have been performed on a 200 nm thick Al0.25Ga0.75As layer at 300 K. The transient photoinduced transmission is observed in the vicinity of the fundamental absorption edge using tunable 150 fs pump pulses with 11 meV and 75 meV excess energy and white light continuum probe pulses. Comparison of the experimental data with a theoretical model, including excitonic as well as plasma effects reveals the dominant influence of Coulomb screening on the band-edge-absorption kinetics. Agreement with the experimental data could only be achieved by using dynamical instead of static screening of all possible scattering processes.
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