Di Stefano, Omar and Savasta, Salvatore and Girlanda, Raffaello (2004) The influence of two-exciton correlations on the dynamics of parametric polariton amplification. Physica Status Solidi (c), 1 (3). pp. 479-483.
We present an overview of our results concerning the influence of two-pair continuum coherences onthe transient nonlinear optical response of semiconductor microcavities. We show that the interplaybetween these 4-particle coherences and the nonperturbative light-matter interaction produces highlydesirable almost decoherence-free exciton-exciton collisions on the lower polariton branch. This effectgives rise to the very different nonlinear absorption rates on the two polariton branches observed inmany experiments and make possible to reach a very-high degree of amplification in samples withlarge Rabi splitting.
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