Phys. Rev. A 66, 023609 (2002) [4 pages]Impurity scattering in a Bose-Einstein condensate at finite temperatureReceived 14 March 2002; published 26 August 2002 We consider the effects of finite temperature on the scattering of impurity atoms in a Bose-Einstein condensate, showing that the scattering rate is enhanced by the thermal atoms. Collisions can increase or decrease the impurity energy. Below the Landau velocity only the first process occurs, i.e., the collisions cool the condensate. Above the critical velocity the dissipative collisions prevail over the cooling ones for sufficiently low temperatures. These considerations are applied to a recent experiment. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.023609
DOI:
10.1103/PhysRevA.66.023609
PACS:
03.75.Fi, 34.50.-s, 67.90.+z
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