Exploring the BEC-BCS Crossover with an Ultracold Gas of $^6$Li Atoms

Details Exploring the BEC-BCS Crossover with an Ultracold Gas of $^6$Li Atoms Exploring the BEC-BCS Crossover with an Ultracold Gas of $^6$Li Atoms

2004-12-27

arxiv.org/abs/cond-mat/0412712v1

Physics

Condensed Matter

Other Condensed Matter

Proceedings of ICAP-2004 (Rio de Janeiro). Review on Innsbruck BEC-BCS crossover experiments with updated Feshbach resonance p

Scientific paper

10.1063/1.1928862

We present an overview of our recent measurements on the crossover from a Bose-Einstein condensate of molecules to a Bardeen-Cooper-Schrieffer superfluid. The experiments are performed on a two-component spin-mixture of $^6$Li atoms, where a Fesh\-bach resonance serves as the experimental key to tune the s-wave scattering length and thus to explore the various interaction regimes. In the BEC-BCS crossover, we have characterized the interaction energy by measuring the size of the trapped gas, we have studied collective excitation modes, and we have observed the pairing gap. Our observations provide strong evidence for superfluidity in the strongly interacting Fermi gas.

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