Observation of Superfluid Flow in a Bose-Einstein Condensed Gas

Details Observation of Superfluid Flow in a Bose-Einstein Condensed Gas Observation of Superfluid Flow in a Bose-Einstein Condensed Gas

2000-06-07

arxiv.org/abs/cond-mat/0006111v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.85.2228

We have studied the hydrodynamic flow in a Bose-Einstein condensate stirred by a macroscopic object, a blue detuned laser beam, using nondestructive {\em in situ} phase contrast imaging. A critical velocity for the onset of a pressure gradient has been observed, and shown to be density dependent. The technique has been compared to a calorimetric method used previously to measure the heating induced by the motion of the laser beam.

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