Savasta, Salvatore and Di Stefano, Omar and Girlanda, Raffaello (2002) Transiet optical stark shift and excitation induced dephasing in the non-perturbative regime. Physica status solidi (a), 190 (3). pp. 833-837. ISSN 0031-8965
We show that the exciton-exciton scattering continuum has a significant influence on the transient non-linear optical response of semiconductor microcavities. Comparison between transient shifts observed in pump and probe experiments and calculations demonstrates almost complete cancellation between mean-field and two-exciton continuum contributions. Moreover, we show that suppression of non-linear absorption of the lower polariton observed in many experiments is determined by the specific spectral shape of these correlations. In particular, we find that the pump induced dephasing of polariton resonances is proportional to the spectrum of four-particle correlations calculated at the energy sum of the pumped and probed polaritons.
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