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Phys. Rev. Lett. 88, 250403 (2002) [4 pages]

Critical Rotation of a Harmonically Trapped Bose Gas

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P. Rosenbusch1, D. S. Petrov2,3, S. Sinha1, F. Chevy1, V. Bretin1, Y. Castin1, G. Shlyapnikov1,2,3, and J. Dalibard1,*
1Laboratoire Kastler Brossel, 24 rue Lhomond, 75005 Paris, France
2FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
3Russian Research Center Kurchatov Institute, Kurchatov Square, 123182 Moscow, Russia

Received 30 January 2002; published 7 June 2002

We study experimentally and theoretically a cold trapped Bose gas under critical rotation, i.e., with a rotation frequency close to the frequency of the radial confinement. We identify two regimes: the regime of explosion where the cloud expands to infinity in one direction, and the regime where the condensate spirals out of the trap as a rigid body. The former is realized for a dilute cloud, and the latter for a condensate with the interparticle interaction exceeding a critical value. This constitutes a novel system in which repulsive interactions help in maintaining particles together.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.250403
DOI:
10.1103/PhysRevLett.88.250403
PACS:
03.75.Fi, 32.80.Lg

*Unité de Recherche de l'Ecole normale supérieure et de l'Université Pierre et Marie Curie, associée au CNRS.

 
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