Role of exchange interaction in Coulomb quantum kinetics
Tom A. W. Wolterink, V. M. Axt, T. Kühn · Physical review. B, Condensed matter · 2003
In a quantum-kinetic approach based on density-matrix formulation we study the role of exchange interaction for ultrafast carrier relaxation. We find that the exchange contributions to scattering and screening tend to compensate each other. With very short times, however, due to the retarded buildup of the screening the exchange contribution to scattering prevails resulting in a reduced relaxation.