Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 47: Quantengase (Bosonen II / Fermionen)
Q 47.6: Vortrag
Donnerstag, 13. März 2008, 17:45–18:00, 1A
Interspecies Feshbach resonances and scattering properties of the ultracold Fermi-Fermi mixture 6Li and 40K — •Andreas Trenkwalder1, Eric Wille1,2, Frederik Spiegelhalder1, Gabriel Kerner1, Devang Naik1, Gerhard Hendl1, Florian Schreck1, Rudolf Grimm1,2, Tobias Tiecke3, Jook Walraven3, Servaas Kokkelmans4, Eite Tiesinga5, and Paul Julienne5 — 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Austria — 2Institut für Experimentalphysik und Forschungszentrum für Quantenphysik, Universität Innsbruck, Austria — 3Van der Waals-Zeeman Institute of the University of Amsterdam, The Netherlands — 4Eindhoven University of Technology, The Netherlands — 5Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, USA
We present recent results on the observation of interspecies Feshbach resonances in the Fermi-Fermi mixture of 6Li and 40K. The mixture is stored in an optical dipole trap and is prepared in different combinations of spin states. At specific values of the magnetic field we observe enhanced atom loss which we can assign with the help of two theoretical models to s- or p-wave Feshbach resonances. The results from a simple model agree well with a full coupled channels analysis. The singlet and triplet scattering lengths are found to be 52.1(3) a0 and 63.5(1) a0 respectively. Our next step will be the formation of bosonic molecules at the identified Feshbach resonances leading towards the creation of a heteronuclear molecular BEC. Preprint: arXiv:0711.2916