8-12 July 2019
Cité des Congrès
Europe/Paris timezone

Light superfluidity in hot atomic vapors

9 Jul 2019, 09:15
Salle GH (Cité des Congrès)

Salle GH

Cité des Congrès


Dr Tom Bienaimé (Laboratoire Kastler Brossel)


A laser field propagating through a hot atomic vapor leads to a third-order nonlinear Kerr susceptibilty. In the paraxial approximation the evolution of the transverse electric field is described by a 2D Gross-Pitaevskii equation. As such, this system is a promising platform to study phenomena related to Bose-Einstein condensation and superfluidity of light.

In this talk, I will report on the measurement of the dispersion relation of small amplitude density waves propagating on top of a photon fluid. We find a dispersion relation of Bogoliubov type: linear at small wave vector as expected in the superfluid regime and "particle-like" (quadratic) at larger wave vectors 1. In the superfluid regime, we characterize the dependence of the sound velocity with intensity (photon density) and compare our results with theoretical predictions.

1 Observation of the Bogoliubov Dispersion in a Fluid of Light, Q. Fontaine, T. Bienaimé, S. Pigeon, E. Giacobino, A. Bramati, and Q. Glorieux, Phys. Rev. Lett. 121, 183604 (2018).

Dispersion relation of small amplitude density waves propagating on top of a photon fluid

Choix de session parallèle 2.3 Fluides quantiques et lumière

Primary authors

Dr Tom Bienaimé (Laboratoire Kastler Brossel) Mr Quentin Fontaine (Laboratoire Kastler Brossel) Dr Simon Pigeon (Laboratoire Kastler Brossel) Prof. Élisabeth Giacobino (Laboratoire Kastler Brossel) Prof. Alberto Bramati (Laboratoire Kastler Brossel) Prof. Quentin Glorieux (Laboratoire Kastler Brossel)

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