Condensats de Bose-Einstein, champs évanescents et champs radio-fréquences

Abstract : This habilitation is devoted to a series of experiments in the context of Bose-Einstein condensation (BEC) in 2D. First, evanescent light fields were used to create highly anisotropic potentials. The production of a condensate at a distance of 3 mm only from a surface was demonstrated for the first time. A precise characterization of the interaction between the atoms and the scattered light field was obtained through the experimental study of the reflection of the condensate from an evanescent field. The diffuse reflection theory of Carsten Henkel et al. was confirmed on a quantitative basis. Despite a strong diffusion, the diffraction in the time domain off a modulated atom mirror was observed with a good contrast.

The second part of the manuscript is devoted to the new approach of the adiabatic rf potentials, proposed by Oliver Zobay and Barry Garraway. These potentials can trap atoms dressed by a rf field, and placed in an inhomogeneous magnetic field. Their geometry is very flexible, allowing the realization of double wells or ring traps, and can be controlled dynamically. We demontrated for the first time the trapping of rf-dressed atoms in a bubble-like geometry. Moreover, these traps are compatible with the high level of requirement of Bose-Einstein condensates, and with \rf-induced evaporative cooling.
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Habilitation à diriger des recherches
Physique Atomique [physics.atom-ph]. Université Paris-Nord - Paris XIII, 2008
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Hélène Perrin. Condensats de Bose-Einstein, champs évanescents et champs radio-fréquences. Physique Atomique [physics.atom-ph]. Université Paris-Nord - Paris XIII, 2008. 〈tel-00355511v2〉

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