Related papers: Parametric pair production of collective excitations in a Bose-Einstein condensate

Parametric pair production of collective excitations in a Bose-Einstein condensate

URL: http://arxiv.org/abs/2508.01654v1
Date: Sun, 03 Aug 2025 08:26:08 GMT
Title: Parametric pair production of collective excitations in a Bose-Einstein condensate
Authors: Victor Gondret, Rui Dias, Clothilde Lamirault, Léa Camier, Amaury Micheli, Charlie Leprince, Quentin Marolleau, Scott Robertson, Denis Boiron, Christoph I. Westbrook,
Abstract summary: We produce longitudinal collective excitations in a pairwise manner in a Bose-Einstein condensate.<n>This process can be seen as an analog to cosmological particle production.<n>We 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.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
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 observation 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.

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