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Abstract: Time resolved photoluminescence is a powerful technique to study thecollective dynamics of excitons and polaritons in semiconductor nanostructures.We present a two excitation pulses technique to induce the ultrafast andcontrolled quenching of the exciton emission in a quantum well. The depth ofthe dip is given by the magnitude of the warming of the carriers induced by thearrival of a laser pulse when an exciton population is already present in thesample. We use this technique to study the relaxation mechanisms of polaritonsin semiconductor microcavities, which are of great importance to enhance theconditions for their condensation under non-resonant excitation. We alsoexplore the dynamics of polariton fluids resonantly created in the lowerpolariton branch in a triggered optical parametric oscillator configuration,showing evidence of polariton superfluidity, and opening up the way to thereal-time study of quantum fluids.



Autor: A. Amo, D. Sanvitto, L. Vina

Fuente: https://arxiv.org/







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