Phys. Rev. Lett. 103, 265301 (2009) [4 pages]Damping of Superfluid Flow by a Thermal CloudReceived 4 September 2009; revised 13 November 2009; published 23 December 2009 One of the principal signatures of superfluidity is the frictionless flow of a superfluid through another substance. Here, we study the flow of a Bose-Einstein condensate through a thermal cloud and study its damping for different harmonic confinements and temperatures. The damping rates close to the collisionless regime are found to be in good agreement with Landau damping and become smaller for more homogeneous systems. In the hydrodynamic regime, we observe additional damping due to collisions, and we discuss the implications of these findings for superfluidity in this system. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.265301
DOI:
10.1103/PhysRevLett.103.265301
PACS:
67.85.De, 03.75.Kk, 47.37.+q, 67.90.+z
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