Observation of Superfluid Flow in a Bose-Einstein Condensed Gas

Abstract

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.

4 pages, 5 figures

References in corpus (4)

• Vortex formation in a stirred Bose-Einstein condensate
• Observation of the scissors mode and superfluidity of a trapped Bose-Einstein condensed gas
• Suppression and enhancement of impurity scattering in a Bose-Einstein condensate
• Dissipation and Vortex Creation in Bose-Einstein Condensed Gases

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