BEC of 6Li2 Molecules: Exploring the BEC-BCS Crossover
Professor Johannes Hecker Denschlag
Institut für Experimentalphysik, Universität Innsbruck, Austria
3:30pm, Wednesday 9 February 2005, Seminar Room AR103, Graduate Research Centre
We report on recent experiments with an ultracold degenerate Fermi gas of 6Li atoms.
We start with Bose-Einstein condensation of Li2 molecules in an optical trap . Using a Feshbach resonance we
can then investigate the BEC-BCS crossover where the molecular condensate is transformed into a strongly interacting gas of
fermions. We probe the crossover with several methods like measurements of the trapped cloud size , collective oscillation
excitations  and binding energy measurements with radio frequency . In these measurements we have been able to show
the existence of a pairing gap  on the BCS side of the resonance. This strongly suggests the presence of a superfluid
phase on the BCS side of the crossover.
 S. Jochim et al., Science 302, 2103 (2003); Published online 13 November 2003; 10.1126/science.1093280
 M. Bartenstein et al., Phys. Rev. Lett. 92, 120401 (2004)
 M. Bartenstein et al., Phys. Rev. Lett. 92, 203201 (2004)
 C. Chin et al., Science 305, 1133 (2004); Published online 22 July 2003
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