Gaz quantiques de potassium 39 à interactions contrôlables

Lauriane Fouche 1
1 Laboratoire Charles Fabry / Optique atomique
LCF - Laboratoire Charles Fabry
Abstract : Potassium 39 is an alkali allowing to control the interactions between atoms thanks to Feshbach resonances. This thesis presents a fast and efficient way to produce all-optical Bose-Einstein condensates of 39K. Our technique is first taking advantage of gray molasses cooling leading to a cold enough sample to directly load an optical trap. Then an optical evaporation is performed near a Feshbach resonance to control the collision rate. Studies in various spin mixtures have allowed us to observe new p-wave Feshbach resonances and a d-wave Feshbach resonance. The later presents unusual properties and has been studied in details to understand the collision processes involved. The model developped is a two stage model, each one of them involving a two body collision. It explains the experimental results obtained. In the produced 39K degenerate Bose gases, tuning interactions near the Feshbach resonance at 560,7 Gauss for the atoms in |F=1,mF=-1> has allowed us to adress different physical problems. For repulsive interactions, we study the expansion of a Bose-Einstein condensate in the 1D-3D dimensional crossover. For attractive interactions we produce bright solitons in a one-dimensional optical trap. Perspectives concerning the study of those degenerate self-confined Bose gases in disordered media are also discussed.
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Lauriane Fouche. Gaz quantiques de potassium 39 à interactions contrôlables. Optique [physics.optics]. Institut d’Optique Graduate School, 2015. Français. ⟨NNT : 2015IOTA0003⟩. ⟨tel-01221004⟩

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