Parametric pair production of collective excitations in a Bose-Einstein condensate
Abstract
By exciting the transverse breathing mode of an elongated Bose-Einstein condensate, we parametrically produce longitudinal collective excitations in a pairwise manner. This process also referred to as Faraday wave generation, can be seen as an analog to cosmological particle production. Building upon single particle detection, we investigate the early time dynamics of the exponential growth and compare our observations with a Bogoliubov description. The growth rate we observe experimentally is in very good agreement with theoretical predictions, demonstrating the validity of the Bogoliubov description and thereby confirming the smallness of quasiparticle interactions in such an elongated gas. We also discuss the presence of oscillations in the atom number, which are due to pair correlations and to the rate at which interactions are switched off.
Keywords
Cite
@article{arxiv.2508.01654,
title = {Parametric pair production of collective excitations in a Bose-Einstein condensate},
author = {Victor Gondret and Rui Dias and Clothilde Lamirault and Léa Camier and Amaury Micheli and Charlie Leprince and Quentin Marolleau and Scott Robertson and Denis Boiron and Christoph I. Westbrook},
journal= {arXiv preprint arXiv:2508.01654},
year = {2025}
}
Comments
5+5 pages, this work is dedicated to Renaud Parentani