Interferences between Bogoliubov excitations and their impact on the evidence of superfluidity in a paraxial fluid of light

• URL: http://arxiv.org/abs/2005.14328v2
• Date: Wed, 3 Jun 2020 08:23:37 GMT
• Title: Interferences between Bogoliubov excitations and their impact on the evidence of superfluidity in a paraxial fluid of light
• Authors: Quentin Fontaine, Pierre-Elie Larr\'e, Giovanni Lerario, Tom Bienaim\'e, Simon Pigeon, Daniele Faccio, Iacopo Carusotto, Elisabeth Giacobino, Alberto Bramati, and Quentin Glorieux
• Abstract summary: Paraxial fluids of light are an alternative platform to atomic Bose-Einstein condensates and superfluid liquids. We show that interferences between the phonon excitations that would be a clear signature of the collective superfluid behaviour have not been observed to date. Results are evidence of a key signature of light superfluidity and provide a novel characterization tool for quantum simulations with photons.
• Score: 0.8336477625900557
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Paraxial fluids of light represent an alternative platform to atomic Bose-Einstein condensates and superfluid liquids for the study of the quantum behaviour of collective excitations. A key step in this direction is the precise characterization of the Bogoliubov dispersion relation, as recently shown in two experiments. However, the predicted interferences between the phonon excitations that would be a clear signature of the collective superfluid behaviour have not been observed to date. Here, by analytically, numerically, and experimentally exploring the phonon phase-velocity, we observe the presence of interferences between counter-propagating Bogoliubov excitations and demonstrate their critical impact on the measurement of the dispersion relation. These results are evidence of a key signature of light superfluidity and provide a novel characterization tool for quantum simulations with photons.

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