Transition from Collisionless to Hydrodynamic Behaviour in an Ultracold Atomic Gas
arXiv:cond-mat/0105441 · doi:10.1103/PhysRevLett.87.173201
Abstract
Relative motion in a two-component, trapped atomic gas provides a sensitive probe of interactions. By studying the lowest frequency excitations of a two spin-state gas confined in a magnetic trap, we have explored the transition from the collisionless to the hydrodynamic regime. As a function of collision rate, we observe frequency shifts as large as 6% as well as a dramatic, non-monotonic dependence of the damping rate. The measurements agree qualitatively with expectations for behavior in the collisionless and hydrodynamic limits and are quantitatively compared to a classical kinetic model.
5 pages, 4 figures
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