Expansion of an ultra-cold lithium gas in the BEC-BCS crossover

Details Expansion of an ultra-cold lithium gas in the BEC-BCS crossover Expansion of an ultra-cold lithium gas in the BEC-BCS crossover

2007-01-09

arxiv.org/abs/cond-mat/0701181v1

Physics

Condensed Matter

Statistical Mechanics

10 pages, to be published in the Proceddings of the 2006 Enrico Fermi summer school on Fermi gases

Scientific paper

We present an experimental study of the time of flight properties of a gas of ultra-cold fermions in the BEC-BCS crossover. Since interactions can be tuned by changing the value of the magnetic field, we are able to probe both non interacting and strongly interacting behaviors. These measurements allow us to characterize the momentum distribution of the system as well as its equation of state. We also demonstrate the breakdown of superfluid hydrodynamics in the weakly attractive region of the phase diagram, probably caused by pair breaking taking place during the expansion.

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