  Local ultrafast optical excitation of electron-hole pairs in disordered
semiconductors provides the possibility to observe experimentally
interaction-assisted propagation of correlated quantum particles in a
disordered environment. In addition to the interaction driven delocalization
known for the conventional single-band TIP-(two-interacting-particles)-problem
the semiconductor model has a richer variety of physical parameters that give
rise to new features in the temporal dynamics. These include different masses,
correlated vs. anticorrelated disorder for the two particles, and dependence on
spectral position of excitation pulse.
