Direct observation of irrotational flow and evidence of superfluidity in a rotating Bose-Einstein condensate

Details Direct observation of irrotational flow and evidence of superfluidity in a rotating Bose-Einstein condensate Direct observation of irrotational flow and evidence of superfluidity in a rotating Bose-Einstein condensate

2001-06-10

arxiv.org/abs/cond-mat/0106182v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.88.070406

We observed the expansion of vortex-free Bose-condensates after their sudden release from a slowly rotating anisotropic trap. Our results show clear experimental evidence of the irrotational flow expected for a superfluid. The expansion from a rotating trap has strong features associated with the superfluid nature of a Bose-condensate, namely that the condensate cannot at any point be cylindrically symmetric with respect to the axis of rotation since such a wavefunction cannot possess angular momentum. Consequently, an initially rotating condensate expands in a distinctively different way to one released from a static trap. We report measurements of this phenomenon in absorption images of the condensate taken along the direction of the rotation axis.

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