Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster Quantengase

Q 27.10: Poster

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

Transport of a quantum degenerate heteronuclear Bose-Fermi mixture in a harmonic trap — Carsten Klempt, Thorsten Henninger, •Oliver Topic, Johannes Will, Stephan Falke, Wolfgang Ertmer, and Jan Arlt — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany

We report on the simultaneous transport of mixed quantum degenerate gases of bosonic ⁸⁷Rb and fermionic ⁴⁰K in a harmonic potential. The samples are transported over a distance of up to 6 mm to the geometric center of the anti-Helmholtz coils of the QUIC trap.

This magnetic transport scheme is an important tool for the manipulation of quantum degenerate gases, since it enables transport experiments with large quantum degenerate samples in macroscopic trap configurations without disturbances added by close by surfaces. Since the mechanism may be cascaded to cover even larger distances, it is of particular relevance for interference experiments which can particularly profit from the signal-to-noise ratio available with large samples.

In addition, this novel method allows all experiments using QUIC traps to significantly improve the experimental conditions. We demonstrate two particular experiments which profit from the transport scheme. By transporting the atoms to the centre of the trap, the highly homogeneous magnetic field that can be created there is available to experiments which exploit Feshbach resonances to tune the atomic interaction. The mechanism may also be used to accelerate and launch atomic clouds for further experiments.