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Finite temperature correction to the Thomas–Fermi approximation for a Bose–Einstein condensate: comparison between theory and experiment

M A Caracanhas1, J A Seman1, E R F Ramos1, E A L Henn1, K M F Magalhães1, K Helmerson2 and V S Bagnato1

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We observe experimentally a deviation of the radius of a Bose–Einstein condensate from the standard Thomas–Fermi prediction, after free expansion, as a function of temperature. A modified Hartree–Fock model is used to explain the observations, mainly based on the influence of the thermal cloud on the condensate cloud.


PACS

03.75.Hh Static properties of condensates; thermodynamical, statistical and structural properties

37.10.De Atom cooling methods

31.15.bt Statistical model calculations (including Thomas–Fermi and Thomas–Fermi–Dirac models)

Subjects

Atomic and molecular physics

Quantum gases, liquids and solids

Computational physics

Dates

Issue 14 (28 July 2009)

Received 16 October 2008, in final form 27 May 2009

Published 18 June 2009



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