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Condensation of Pairs of Fermionic Atoms near a Feshbach Resonance

2004; American Physical Society; Volume: 92; Issue: 12 Linguagem: Inglês

10.1103/physrevlett.92.120403

1092-0145

Martin W. Zwierlein, C. A. Stan, Christian H. Schunck, S. M. F. Raupach, Andrew J. Kerman, Wolfgang Ketterle,

Quantum, superfluid, helium dynamics

We have observed Bose-Einstein condensation of pairs of fermionic atoms in an ultracold 6Li gas at magnetic fields above a Feshbach resonance, where no stable 6Li2 molecules would exist in vacuum. We accurately determined the position of the resonance to be 822+/-3 G. Molecular Bose-Einstein condensates were detected after a fast magnetic field ramp, which transferred pairs of atoms at close distances into bound molecules. Condensate fractions as high as 80% were obtained. The large condensate fractions are interpreted in terms of preexisting molecules which are quasistable even above the two-body Feshbach resonance due to the presence of the degenerate Fermi gas.