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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster Ultrakalte Moleküle
Q 51.5: Poster
Thursday, March 13, 2008, 16:30–19:00, Poster C2
Few-body physics with ultracold Cs atoms and molecules — •Steven Knoop1, Martin Berninger1, Francesca Ferlaino1, Harald Schöbel1, Michael Mark1, Hanns-Christoph Nägerl1, and Rudolf Grimm1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Innsbruck, Austria
Ultracold atomic gases are versatile systems to study few-body physics because of full control over the external and internal degrees of freedom and the magnetic tunability of the scattering properties using Feshbach resonances. Here we experimentally study three- and four-body physics by investigating ultracold (30-250 nK) atom-dimer and dimer-dimer collisions with Cs Feshbach molecules in various molecular states and Cs atoms in different hyperfine states. Resonant enhancement of the atom-dimer relaxation rate is observed in a system of three identical bosons and interpreted as being induced by a trimer state, possibly an Efimov state. A strong magnetic field dependence of the relaxation rate is also observed when the atoms are transferred to a different hyperfine sublevel [1]. For dimer-dimer collisions we have observed an unexpected temperature dependence and a suppression of the collisional loss rate [2].
[1] S. Knoop et al., in preparation [2] F. Ferlaino et al., in preparation