1. Excitonic oscillator-strength saturation dominates polariton-polariton interactions
- Author
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Richard, Maxime, Frérot, Irénée, Ravets, Sylvain, Bloch, Jacqueline, Anton-Solanas, Carlos, Claude, Ferdinand, Zhou, Yueguang, Morassi, Martina, Lemaître, Aristide, Carusotto, Iacopo, and Minguzzi, and Anna
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Quantum Gases - Abstract
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.
- Published
- 2025