Crossover from exciton to biexciton cavity polaritons

SABA, MICHELE;QUOCHI, FRANCESCO;Ciuti C;Oesterle U;Staehli JL;Deveaud B;BONGIOVANNI, GIOVANNI LUIGI CARLO;MURA, ANTONIO ANDREA

2000-01-01

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Abstract

We report novel oscillator strength transfer phenomena induced by the exciton-exciton correlation. A high quality semiconductor microcavity is resonantly excited by intense circularly polarised sigma(+) pump pulses (100 fs long) and probed at different delays by weak counter-polarised sigma(-) test pulses. We show that the presence of sigma(+) excitons can completely inhibit the creation of sigma(-) excitons. With increasing sigma(+) exciton density the oscillator strength of the a- transition is transferred to the biexciton transition, permitting the first observation of the strong coupling regime between the biexciton transition and the cavity photon mode, i.e., the biexciton polariton states.