Abstract
Many-body effects between excited carriers are demonstrated to be responsible for the behavior of intensity and phase of the transmitted light in pulse propagation experiments. The optical response is described by a Bethe-Salpeter equation including the renormalization of interband selfenergy and of Coulomb interaction as the two relevant many-body effects. In contrast to previously used quasi-particle approximations these two-particle properties have to be taken into account in dependence on both wave number and energy to give a appropriate description of the spectral properties of excitonic polaritons. Furthermore the interplay with corresponding one-particle properties of the carriers is discussed.
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