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Article Dans Une Revue Physical Review B Année : 2023

Spectrum of collective excitations of a quantum fluid of polaritons

Résumé

We use a recently developed high-resolution coherent probe spectroscopy method to investigate the dispersion of collective excitations of a polaritonic quantum fluid. We measure the dispersion relation with high energy and wave-number resolution, which allows to determine the speed of sound in the fluid and to evidence the contribution of an excitonic reservoir. We report on the generation of collective excitations at negative energies, on the ghost branch of the dispersion curve. Precursors of dynamical instabilities are also identified. Our methods open the way to the precise study of quantum hydrodynamics of quantum fluids of light.

Dates et versions

hal-04096357 , version 1 (12-05-2023)

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F Claude, M.J Jacquet, I Carusotto, Q Glorieux, E Giacobino, et al.. Spectrum of collective excitations of a quantum fluid of polaritons. Physical Review B, 2023, 107 (17), pp.174507. ⟨10.1103/PhysRevB.107.174507⟩. ⟨hal-04096357⟩
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