Superfluidity in sympathetic cooling with atomic Bose condensates

Details Superfluidity in sympathetic cooling with atomic Bose condensates Superfluidity in sympathetic cooling with atomic Bose condensates

1997-07-30

arxiv.org/abs/cond-mat/9707323v1

Physics

Condensed Matter

13 pages,2 figures

Scientific paper

10.1103/PhysRevLett.80.3419

The dynamical structure of an atomic Bose-Einstein condensate limits the efficiency of the condensate in cooling slow impurity atoms. To illustrate the point, we show that an impurity atom moving in a homogeneous zero-temperature condensate is not scattered incoherently if its velocity is lower than the condensate sound velocity $c$, limiting cooling to velocities $v \geq c$. This striking effect is an expression of superfluidity and provides a direct means to detect the fundamental property of superfluidity in atomic condensates. Furthermore, we show that the fermionic lithium-isotope, $^{6}$Li, is a reasonable candidate for sympathetic cooling by a $^{23}$Na-condensate.

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