Observation of deviations from ideal gas thermodynamics in a trapped Bose-Einstein condensed gas

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dc.creatorGerbier, Fabrice
dc.creatorThywissen, Joseph H.
dc.creatorRichard, Simon
dc.creatorHugbart, Mathilde
dc.creatorBouyer, Philippe
dc.creatorAspect, Alain
dc.date2004-01-28
dc.date.accessioned2026-07-07T06:34:49Z
dc.date.available2026-07-07T06:34:49Z
dc.descriptionWe have investigated experimentally the finite-temperature properties of a Bose-Einstein condensed cloud of $^{87}$Rb atoms in a harmonic trap. Focusing primarily on condensed fraction and expansion energy, we measure unambiguous deviations from ideal-gas thermodynamics, and obtain good agreement with a Hartree-Fock description of the mixed cloud. Our results offer for the first time clear evidence of the mutual interaction between the condensed and thermal components. To probe the low-temperature region unaccessible to the usual time-of-flight technique, we use coherent Bragg scattering as a filtering technique for the condensate. This allows us to separate spatially the condensed and normal components in time of flight, and to measure reliably temperatures as low as $0.2 T_{\rm c}^0$ and thermal fractions as low as 10%.Finally, we observe evidence for the limitations of the usual image analysis procedure, pointing out to the need for a more elaborate model of the expansion of the mixed cloud.
dc.identifierhttps://arxiv.org/abs/cond-mat/0401585
dc.identifierhttp://arxiv.org/abs/cond-mat/0401585
dc.identifierPhysical Review A 70 (2004) 013607
dc.identifierdoi:10.1103/PhysRevA.70.013607
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/99644
dc.subjectOther Condensed Matter
dc.subjectStatistical Mechanics
dc.titleObservation of deviations from ideal gas thermodynamics in a trapped Bose-Einstein condensed gas
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