Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 11, Pages 2228-2231Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.2228
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We have studied the hydrodynamic flow in a Bose-Einstein condensate stirred by a macroscopic object, a blue-detuned laser beam, using nondestructive in situ phase contrast imaging. A critical velocity fur 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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