Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas

Abstract

We demonstrate a reversible conversion of a Li2 molecular Bose-Einstein condensate to a degenerate Fermi gas of atoms by adiabatically crossing a Feshbach resonance. By optical in situ imaging, we observe a smooth change of the cloud size in the crossover regime. On the Feshbach resonance, the ensemble is strongly interacting and the measured cloud size is 75(7)% of the one of a non-interacting zero-temperature Fermi gas. The high condensate fraction of more than 90% and the adiabatic crossover suggest our Fermi gas to be cold enough to form a superfluid.

5 pages, 4 figures, accepted by PRL

References in corpus (2)

• Observation of Bose-Einstein Condensation of Molecules
• Pure Gas of Optically Trapped Molecules Created from Fermionic Atoms

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