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Excitonic oscillator-strength saturation dominates polariton-polariton interactions

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arxiv 2501.07899 v1 pith:FU6FI4L7 submitted 2025-01-14 cond-mat.mes-hall cond-mat.quant-gas

Maxime Richard , Irénée Frérot , Sylvain Ravets , Jacqueline Bloch , Carlos Anton-Solanas , Ferdinand Claude , Yueguang Zhou , Martina Morassi
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Aristide Lemaître Iacopo Carusotto and Anna Minguzzi
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classification cond-mat.mes-hallcond-mat.quant-gas
keywords interactionspolariton-polaritonclosermechanismsaturationadditionalbogoliubovbranches
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Exciton-polaritons in semiconductor microcavities exhibit large two-body interactions that, thanks to ever refined nanotechnology techniques, are getting closer and closer to the quantum regime where single-photon nonlinearities start being relevant. To foster additional progress in this direction, in this work we experimentally investigate the microscopic mechanism driving polariton-polariton interactions. We measure the dispersion relation of the collective excitations that are thermally generated on top of a coherent fluid of interacting lower-polaritons. By comparing the measurements with the Bogoliubov theory over both the lower and upper polariton branches simultaneously, we find that polariton-polariton interactions stem dominantly from a mechanism of saturation of the exciton oscillator strength.

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  1. Polaritonic Machine Learning for Graph-based Data Analysis

    cond-mat.dis-nn 2025-07 conditional novelty 6.0 of 10

    Simulated polariton condensate lattices act as physics-based feature generators for CNNs and improve classification of cliques and asymmetries in point clouds over raw point images in three synthetic tasks.

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