Berlin 2005 – wissenschaftliches Programm

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SYUA: Mesoscopic Physics of Ultracold Atoms

SYUA 2: Optical Lattices

SYUA 2.1: Hauptvortrag

Mittwoch, 9. März 2005, 14:00–14:30, HU Audimax

BEC of 6Li2 molecules: Exploring the BEC-BCS crossover — •Johannes Hecker-Denschlag — Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria

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.