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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster Quantengase

Q 27.5: Poster

Tuesday, March 11, 2008, 16:30–19:00, Poster C2

Mesoscopic physics in quantum gases — •Bruno Zimmermann, Torben Müller, Henning Moritz, and Tilman Esslinger — Institute of Quantum Electronics, ETH Zürich, Hönggerberg, CH-8093 Zürich, Switzerland

We present an experimental setup which allows us to study an ultracold fermionic quantum gas in a potential that can be arbitrarily controlled down to the smallest relevant length scale, i.e. that of the atomic wavefunction. The basic idea is to prepare an ultracold gas of fermionic lithium in a region of high optical access by using standard laser cooling and trapping technics, followed by a transport and direct evaporation in an optical dipole trap. In the final position the gas will be sandwiched between two microscopes. The shape of the laser beams focused by these microscopes, i.e. the shape of the optical potential, will be controlled by spatial light modulators. The interaction strength of colliding atoms can be tuned by accessing a Feshbach resonance. This setup will allow us to study Josephson oscillations in the BEC-BCS crossover regime and to manipulate strongly correlated atomic samples on a local scale. First results on the cooling and trapping will be shown.