Phys. Rev. Lett. 85, 2228–2231 (2000)Observation of Superfluid Flow in a Bose-Einstein Condensed GasReceived 5 June 2000; published in the issue dated 11 September 2000 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 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.2228
DOI:
10.1103/PhysRevLett.85.2228
PACS:
03.75.Fi, 67.40.Vs, 67.57.De
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