Excitation and polarization effects in semiconductor four-wave-mixing spectroscopy

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Abstract
The dependence of optical four-wave-mixing (FWM) signals in semiconductors on carrier density and laser-field polarization is investigated. The theoretical and experimental analysis reveals the importance of the excitation-induced dephasing processes for the understanding of numerous published results on polarization selections rules in FWM signals. Even apparently contradictory earlier findings can be explained with this theoretical model.