Transition from Collisionless to Hydrodynamic Behaviour in an Ultracold Atomic Gas

Details Transition from Collisionless to Hydrodynamic Behaviour in an Ultracold Atomic Gas Transition from Collisionless to Hydrodynamic Behaviour in an Ultracold Atomic Gas

2001-05-22

arxiv.org/abs/cond-mat/0105441v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.173201

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.

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