Bogoliubov excitations driven by thermal lattice phonons in a quantum fluid of light

Abstract

The elementary excitations in weakly interacting quantum fluids have a non-trivial nature which is at the basis of defining quantum phenomena such as superfluidity. These excitations and the physics they lead to have been explored in closed quantum systems at thermal equilibrium both theoretically within the celebrated Bogoliubov framework, and experimentally in quantum fluids of ultracold atoms. Over the past decade, the relevance of Bogoliubov excitations has become essential to understand quantum fluids of interacting photons. Their driven-dissipative character leads to distinct properties with respect to their equilibrium counterparts. For instance, the condensate coupling to the photonic vacuum environment leads to a non-zero generation rate of elementary excitations with many striking implications. In this work, considering that quantum fluids of light are often hosted in solid-state systems, we show within a joint theory-experiment analysis that the vibrations of the crystal constitute another environment that the condensate is fundamentally coupled to. This coupling leads to a unique heat transfer mechanism, resulting in a large generation rate of elementary excitations in typical experimental conditions, and to a fundamental non-zero contribution at vanishing temperatures. Our work provides a complete framework for solid-embedded quantum fluids of light, which is invaluable in view of achieving a regime dominated by photon vacuum fluctuations.

Main text: 24 pages 6 figures, Supplementary Information : 4 pages, 3 figures

References in corpus (9)

• Quantum fluids of light
• Observation of Superfluidity of Polaritons in Semiconductor Microcavities
• Excitations in a non-equilibrium Bose-Einstein condensate of exciton-polaritons
• Observation of KPZ universal scaling in a one-dimensional polariton condensate
• Double-degenerate Bose-Fermi mixture of strontium
• Effect of interface disorder on quantum well excitons and microcavity polaritons
• Stochastic Gross-Pitaevskii Equation for the Dynamical Thermalization of Bose-Einstein Condensates
• Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture
• Bogoliubov excitations of a polariton condensate in dynamical equilibrium with an incoherent reservoir

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• Microscopic theory of polariton-polariton interactions
• Beyond-mean-field corrections to the blueshift of a driven-dissipative exciton-polariton condensate
• Phase diagram and universal scaling regimes of two-dimensional exciton-polariton Bose-Einstein condensates
• How to exploit driving and dissipation to stabilize and manipulate quantum many-body states
• Space-time first-order correlations of an open Bose-Hubbard model with incoherent pump and loss