Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster I

Q 29.1: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 8 Foyer

Few-body physics in an ultracold Bose-Bose mixture — •Claudia Weber^1,3, Giovanni Barontini¹, Jacopo Catani^1,2, Francesco Rabatti¹, Gregor Thalhammer¹, Francesco Minardi^1,2, and Massimo Inguscio^1,2 — ¹LENS - European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica, Università di Firenze, Sesto Fiorentino (Firenze), Italy — ²CNR-INFM, Sesto Fiorentino (Firenze), Italy — ³Institut für Angewandte Physik, Universität Bonn, Bonn, Germany

We report on the creation of heterospecies bosonic molecules. Using a resonantly modulated magnetic field they are associated from an ultracold Bose-Bose mixture of ⁴¹K and ⁸⁷Rb close to Feshbach resonances. Analyzing the data we determine the binding energy of the weakly bound molecular states depending on the Feshbach field and can explain nontrivial features as the broadening and asymmetry of the association spectrum due to the thermal distribution of the atoms. Furthermore we observe heteronuclear Efimov resonances for both series KKRb and KRbRb next to the Feshbach resonance at 38 G.