Abstract

The influence of electron–electron scattering processes on the time evolution of four-wave mixing signals for ultrashort excitation in the vicinity of the band edge is investigated. The validity of a Markovian approximation is carefully analyzed. The Markovian relaxation of the one-particle distribution is compared with non-Markovian results obtained from the solution of quantum-kinetic equations for two-point functions. In the non-Markovian case relaxation processes are slowed down.

© 1996 Optical Society of America

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