THEORETICAL-STUDY OF SOLITON-LIKE PROPAGATION OF PICOSECOND LIGHT-PULSES INTERACTING WITH WANNIER EXCITONS

An analytical and numerical study of Light pulse propagation in semico nductors, with pulses spectrally centered at the lowest exciton resona nce, is presented. It is shown that, in the limit of negligible phase- space blocking effects, the equation for the excitonic polarization is equivalent to a modified version of the nonlinear Schrodinger equatio n, for which soliton solutions have been derived by Mihalache er nl. [ D. Mihalache et nl., Phys. Rev. A 47, 3190 (1993)]. The numerical stud y demonstrates the solitonlike propagation of experimentally relevant input pulses in CdSe crystal and assesses the influence of phase-space blocking effects and dephasing processes.