Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.18: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Creation of Fermi-Bose mixture of 6Li and 133Cs at ultracold temperatures — •Stephan Häfner1, Juris Ulmanis1, Rico Pires1, Eva D. Kuhnle1, Matthias Weidemüller1, and Eberhard Tiemann2 — 1Physikalisches Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover,Welfengarten 1, 30167 Hannover, Germany
An ultracold Fermi-Bose mixture of 6Li and 133Cs is an ideal system for the study of Efimov’s scenario, which predicts an infinite series of geometrically spaced three-body bound states in the limit of resonant pairwise interactions. Due to the large mass imbalance the universal scaling factor is reduced to 4.9, which makes the observation of a series of resonances feasible. Recently we observed two consecutive Efimov resonances close to a broad Feshbach resonance at temperatures of 400 nK [1]. In this poster we present the route to obtain temperatures below 100 nK for this strongly mass imbalanced mixture involving the combination of optical dipole traps at different wavelengths for an optimized species selective trapping potential. In addition, we measure the binding energy of the least bound molecular state near the broad LiCs Feshbach resonances and compare them to a coupled-channels calculation, which extends our previous analysis [2] of the LiCs scattering properties.
[1] R. Pires et al., PRL 112, 250404 (2014)
[2] R. Pires et al., PRA 90, 012710 (2014)