Abstract

We investigate the coherent dynamics at the band edge of GaAs at low temperatures for carrier densities ranging from 4.3 × 1014 cm−3 to 4.4 × 1017 cm−3 by means of spectrally resolved transient four-wave mixing with 14-fs pulses. At large nonequilibrium carrier densities we observe oscillations with an energy-dependent oscillation period related to interference among continuum states. The experimental findings are compared with a simple model. This comparison delivers a weak energy dependence of dephasing in the initial buildup phase of screening.

© 1996 Optical Society of America

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