Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.93: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Magnetic field dependence of collisions in ultracold YbRb mixtures — •Fabian Wolf, Cristian Bruni, Ali Al-Masoudi, Arnd Obert, Kira Borkowski, and Axel Görlitz — Institut für Experimentalphysik, HHU Düsseldorf, 40225 Düsseldorf

Due to its paramagnetic ground state YbRb is an interesting candidate for the realization of dipolar molecules with additional degrees of freedom. Exploration of magnetically tunable collision properties may eventually offer the possibility to associate ultracold atoms to molecules via Feshbach association. Recent theoretical work suggest that in mixtures of alkali and spin-singlet atoms a coupling between the entrance channel and the bound state channels exists [2]. This coupling leads to the existence of narrow Feshbach resonances. Via two-photon photoassociation spectroscopy the binding energies of weakly bound vibrational levels in YbRb were determined [1] and the positions of possible magnetic Feshbach resonances were predicted. Here we report on the current status of the experiment where we measure the atom loss in an optically trapped YbRb mixture under the influence of a tunable magnetic field.
F.Münchow, C. Bruni, M. Madalinski, and A. Görlitz. Two-photon photoassociation spectroscopy of heteronuclear YbRb. PCCP, 13(42):18734 - 18737, (2011).
Piotr S. Zuchowski, J. Aldegunde, and Jeremy M. Hutson. Ultracold RbSr molecules can be formed by magnetoassociation. Phys. Rev. Lett., 105(15):153201, (2010).