Superfluidity in sympathetic cooling with atomic Bose condensates

Abstract

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 $v\ge c$. 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.

13 pages,2 figures

References in corpus (1)

• Superfluidity of spin-polarized 6Li

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