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Expansion of a lithium gas in the BEC-BCS crossover
L. Tarruell, M. Teichmann, J. McKeever, T. Bourdel, J. Cubizolles, N. Navon, F. Chevy, C. Salomon, L. Khaykovich, J. Zhang
845 - 855
10.3254/978-1-58603-846-5-845
Proceedings of the International School of Physics "Enrico Fermi"
Volume 164: Ultra-cold Fermi Gases
Abstract

We present an experimental study of the time-of-flight properties of a gas of ultracold 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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