Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 6: Ultrakalte Moleküle (mit MO)
Q 6.5: Talk
Monday, March 2, 2009, 11:45–12:00, VMP 8 HS
Ultracold Heteronuclear Fermi-Fermi Molecules — •Arne-Christian Voigt1,2, Matthias Taglieber1,2, Louis Costa1,2, Takatoshi Aoki1,2, Wolfgang Wieser1,2, Theodor W. Hänsch1,2, and Kai Dieckmann1,2 — 1Department für Physik der Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching
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, 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 present the production of 6Li-40K heteronuclear molecules based on our experimental platform for the production of a two-species mixture of quantum-degenerate Fermi gases [1]. We studied two s-wave Feshbach resonances between lithium and potassium at 155 G and 168 G. By magnetic field sweeps we created about 4× 104 6Li-40K molecules at conversion efficiencies of up to 50 % [2]. With a Stern-Gerlach purification technique we are able to image molecules and atoms spatially separated from each other. We show an increased molecule lifetime close to resonance of more than 100 ms in the molecule-atom mixture.
[1] M. Taglieber et al., Phys. Rev. Lett. 100, 010401 (2008).
[2] A.-C. Voigt et al., accepted for publication in Phys. Rev. Lett.