[Production paramétrique de paires d’excitations collectives dans un condensat de Bose–Einstein]
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.
Nous excitons le mode de respiration transverse d’un condensat de Bose–Einstein allongé afin de générer, de manière paramétrique, des paires d’excitations collectives longitudinales. Ce processus, souvent dénommé instabilité de Faraday, peut également être interprété comme analogue à la production cosmologique de particules. Dans ce travail, nous tirons parti de notre système capable de détecter un atome unique pour étudier le développement du motif généré et sa croissance exponentielle. Nous comparons nos observations à celles prédites par la théorie de Bogoliubov pour un système homogène. Le taux de croissance que nous mesurons expérimentalement est en très bon accord avec celui prédit théoriquement, ce qui confirme la validité de la description du système via la théorie de Bogoliubov ainsi que la faiblesse des interactions entre quasiparticules dans un condensat très allongé. Nous discutons également de la présence d’oscillations dans le nombre d’atomes détectés, résultant du processus de création par paires et du temps mis pour éteindre les interactions interatomiques.
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Mots-clés : Amplification paramétrique, condensat de Bose–Einstein, ondes de Faraday, quasiparticules, excitations collectives, gravité analogue, univers primordial
Victor Gondret 1 ; Rui Dias 1 ; Clothilde Lamirault 1 ; Léa Camier 1 ; Amaury Micheli 2 ; Charlie Leprince 1 ; Quentin Marolleau 1 ; Scott Robertson 3 ; Denis Boiron 1 ; Christoph I. Westbrook 1
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@article{CRPHYS_2024__25_S2_A19_0,
author = {Victor Gondret and Rui Dias and Clothilde Lamirault and L\'ea Camier and Amaury Micheli and Charlie Leprince and Quentin Marolleau and Scott Robertson and Denis Boiron and Christoph I. Westbrook},
title = {Parametric pair production of collective excitations in a {Bose{\textendash}Einstein} condensate},
journal = {Comptes Rendus. Physique},
year = {2024},
publisher = {Acad\'emie des sciences, Paris},
doi = {10.5802/crphys.266},
language = {en},
note = {Online first},
}
TY - JOUR AU - Victor Gondret AU - Rui Dias AU - Clothilde Lamirault AU - Léa Camier AU - Amaury Micheli AU - Charlie Leprince AU - Quentin Marolleau AU - Scott Robertson AU - Denis Boiron AU - Christoph I. Westbrook TI - Parametric pair production of collective excitations in a Bose–Einstein condensate JO - Comptes Rendus. Physique PY - 2024 PB - Académie des sciences, Paris N1 - Online first DO - 10.5802/crphys.266 LA - en ID - CRPHYS_2024__25_S2_A19_0 ER -
%0 Journal Article %A Victor Gondret %A Rui Dias %A Clothilde Lamirault %A Léa Camier %A Amaury Micheli %A Charlie Leprince %A Quentin Marolleau %A Scott Robertson %A Denis Boiron %A Christoph I. Westbrook %T Parametric pair production of collective excitations in a Bose–Einstein condensate %J Comptes Rendus. Physique %D 2024 %V 25 %N S2 %I Académie des sciences, Paris %Z Online first %R 10.5802/crphys.266 %G en %F CRPHYS_2024__25_S2_A19_0
Victor Gondret; Rui Dias; Clothilde Lamirault; Léa Camier; Amaury Micheli; Charlie Leprince; Quentin Marolleau; Scott Robertson; Denis Boiron; Christoph I. Westbrook. Parametric pair production of collective excitations in a Bose–Einstein condensate. Comptes Rendus. Physique, Online first (2024), pp. 1-15. doi: 10.5802/crphys.266
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