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Gaz bidimensionnel de Bosons ultrafroids
Nouvelle expérience de condensation de Bose-Einstein

Abstract : This thesis manuscript is divided into two parts. The first one presents the recent results concerning bidimensional (2D) Bose gases. In a homogenous and interacting 2D Bose gas, even there is no Bose-Einstein condensate at finite temperature, a transition between a normal phase and a superfluid phase was predicted by Berezinskii, Kosterlitz, and Thouless. Our experience consisted in studying this transition for an atomic gas in a harmonic trap. For this purpose, we cut a tridimensional Bose-Einstein condensate into two independent 2D clouds. We studied both the loss of quasi-coherence in the system above a critical temperature and the proliferation of free vortices resulting from the breaking of the vortex/antivortex pairs present in the quasi-coherent phase. The coincidence between these two phenomena is typical of the transition predicted by Kosterlitz and Thouless. The second part concerns the conception and the building of a new experimental system of Bose-Einstein condensation. The experience over the last ten years, since the production of the first condensate of cold atoms was used to build a simple and robust apparatus. The main particularity of this system is the implementation of a magnetic transport allowing the atoms to travel between the two distinctive chambers, the second one allowing a good optical access.
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Contributor : Baptiste Battelier <>
Submitted on : Friday, October 19, 2007 - 4:47:18 PM
Last modification on : Monday, December 14, 2020 - 9:51:11 AM
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  • HAL Id : tel-00180679, version 1


Baptiste Battelier. Gaz bidimensionnel de Bosons ultrafroids
Nouvelle expérience de condensation de Bose-Einstein. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2007. Français. ⟨tel-00180679⟩



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