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Phys. Rev. Lett. 87, 050404 (2001) [4 pages]

Phase-Fluctuating 3D Bose-Einstein Condensates in Elongated Traps

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D. S. Petrov1,3, G. V. Shlyapnikov1,2,3, and J. T. M. Walraven1,*
1FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
2Laboratoire Kastler Brossel, Ecole Normale Superieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France
3Russian Research Center, Kurchatov Institute, Kurchatov Square, 123182 Moscow, Russia

Received 20 April 2001; published 16 July 2001

We find that in very elongated 3D trapped Bose gases, even at temperatures far below the BEC transition temperature Tc, the equilibrium state will be a 3D condensate with fluctuating phase (quasicondensate). At sufficiently low temperatures the phase fluctuations are suppressed and the quasicondensate turns into a true condensate. The presence of the phase fluctuations allows for extending thermometry of Bose-condensed gases well below those established in current experiments.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.050404
DOI:
10.1103/PhysRevLett.87.050404
PACS:
03.75.Fi, 05.30.Jp

*LKB is a unité de recherche de l’Ecole Normale Supérieure et de l’Université Pierre et Marie Curie, associée au CNRS.

 
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