SEMICONDUCTOR KADANOFF-BAYM EQUATION RESULTS FOR OPTICALLY-EXCITED ELECTRON-HOLE PLASMAS IN QUANTUM-WELLS

We present results from solutions of the semiconductor Kadanoff-Baym e quations (full two-time semiconductor Bloch equations) with self-energ ies in quasistatic Born approximation, for GaAs single quantum wells. The concentrate on memory and correlation effects: under fs-pulse exci tation con conditions. A remarkable feature is the observed kinetic en ergy increase which is due to the build-up of correlations among the g enerated carriers. We demonstrate that the two-time approach is (i) ve ry well suited to study correlation phenomena both on short and long t imes: thereby avoiding well known problems of one-time kinetic equatio ns, and (ii) that it is becoming practical with the use of efficient i ntegration techniques.