Spectrum of collective excitations of a quantum fluid of polaritons

Abstract

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 wavenumber resolution, which allows us 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.

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Cited by in corpus (7)

• Polariton Fluids as Quantum Field Theory Simulators on Tailored Curved Spacetimes
• Negative frequencies in pulse propagation equations and the double analytic signal
• Analogue gravitational lensing in optical Bose-Einstein condensates
• Space-time first-order correlations of an open Bose-Hubbard model with incoherent pump and loss
• Quantum hydrodynamics of a polariton fluid: pure energy relaxation terms
• Bound Bogoliubov quasiparticles in photon superfluids
• Acoustic horizons and the Hawking effect in polariton fluids of light