Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster Quantengase

Q 64.5: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster C

A Platform for Experiments with Multiple-Species Mixtures of Quantum-Degenerate Gases — •Matthias Taglieber, Arne-Christian Voigt, Wolfgang Wieser, Christoph Eigenwillig, Takatoshi Aoki, Theodor W. Hänsch, and Kai Dieckmann — MPI for Quantum Optics, Hans-Kopfermann-Str. 1, D-85748 Garching and LMU Munich, Schellingstr. 4/III, D-80799 Munich

Spin mixtures of quantum-degenerate fermionic gases exhibit long lifetimes in the strongly-interacting regime near a Feshbach resonance. This has opened the door for numerous key experiments like the creation of Fermi-Fermi molecules, the realization of molecular BEC, and the observation of a pairing gap and of superfluidity in a fermionic gas in the BEC-BCS cross-over region near a Feshbach resonance.

We have set up an apparatus for the generation of a two-species mixture of quantum-degenerate Fermi gases. This additional degree of freedom bears the prospect for the realization of superfluid phases with inhomogeneous order parameter, of long-range pairing due to an induced attractive interaction, and of stable, dipolar Fermi-Fermi molecules. Our production scheme for quantum-degenerate fermionic ⁶Li and ⁴⁰K and bosonic ⁸⁷Rb gases is based on loading of a multiple-species magneto-optical trap with lithium from a Zeeman slower and potassium and rubidium from vapor dispensers. The atoms are then magnetically trapped and transferred from the MOT chamber to a UHV chamber, where the fermions are sympathetically cooled by rubidium. We present details of our setup and show the latest experimental results.