Parametric pair production of collective excitations in a Bose–Einstein condensate
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.
Authors
- Amaury Micheli (ORCID: https://orcid.org/0000-0002-5240-140X)
- C. I. Westbrook (ORCID: https://orcid.org/0000-0002-6490-0468)
- Scott Robertson (ORCID: https://orcid.org/0000-0001-5919-8320)
- Rui Dias (ORCID: https://orcid.org/0009-0004-4158-7693)
- Quentin Marolleau (ORCID: https://orcid.org/0009-0002-3587-3912)
- Denis Boiron (ORCID: https://orcid.org/0000-0002-2719-5931)
- Charlie Leprince (ORCID: https://orcid.org/0009-0002-5490-6767)
- Victor Gondret (ORCID: https://orcid.org/0009-0005-8468-161X)
- Clothilde Lamirault (ORCID: https://orcid.org/0009-0001-6468-2181)
- Léa Camier (ORCID: https://orcid.org/0009-0003-4345-3608)
Publication Details
- Journal
- Comptes Rendus Physique
- Published
- 2025-11-03
- DOI
- https://doi.org/10.5802/crphys.266
- Primary Topic
- Cold Atom Physics and Bose-Einstein Condensates
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Agence Nationale de la Recherche
- Centre National de la Recherche Scientifique
- Laboratoire d’excellence Physique Atomes Lumière Matière
- QuantERA
- Fundação para a Ciência e a Tecnologia