Observation of the scissors mode and superfluidity of a trapped Bose-Einstein condensed gas

Details Observation of the scissors mode and superfluidity of a trapped Bose-Einstein condensed gas Observation of the scissors mode and superfluidity of a trapped Bose-Einstein condensed gas

1999-11-12

arxiv.org/abs/cond-mat/9911195v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.84.2056

We report the observation of the scissors mode of a Bose-Einstein condensed gas of 87^Rb atoms in a magnetic trap, which gives direct evidence of superfluidity in this system. The scissors mode of oscillation is excited by a sudden rotation of the anisotropic trapping potential. For a gas above T_c (normal fluid) we detect the occurrence of oscillations at two frequencies, with the lower frequency corresponding to the rigid body value of the moment of inertia. Well below T_c the condensate oscillates at a single frequency, without damping, as expected for a superfluid.

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