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 σ+ pump pulses (100 fs long) and probed at different delays by weak counter-polarised σ— test pulses. We show that the presence of σ+ excitons can completely inhibit the creation of σ— excitons. With increasing σ+ exciton density the oscillator strength of the σ— 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.
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