On the electronic relaxation in substitutional alloys

The many-electron system in a single-band model is perturbed by intruding an additional planewave particle. The time dependence of the momentum density matrix is shown to be related to the one-particle correlation function, both of them being determined by the spectral weight function. In some cases, the system shows an oscillatory approach to equilibrium.Ke Karlovu 3, Praha 2, Czechoslovakia.The authors are much indebted to Dr. B. Velický, CSc, for many valuable discussions regarding the work. Helpful comments of several other colleagues are also acknowledged.