Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie

Q 57.21: Poster

Donnerstag, 17. März 2011, 16:30–19:30, P1

Perspectives of Few Body Physics in an Ultracold Mixture of ⁶Li and ¹³³Cs — •Romain Müller, Marc Repp, Rico Pires, Juris Ulmanis, Stefan Schmidt, Kristina Meyer, and Matthias Weidemüller — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

The ability to precisely control the interactions in a Bose-Fermi mixture of ¹³³Cs and ⁶Li at phase-space densities close to quantum degeneracy results in the opportunity to study many different aspects of few- and many body physics in a system with the highest mass imbalance between alkali atoms.

To observe few body effects precise characterization and tuning of interspecies interactions via magnetic field (i.e. knowledge of Feshbach resonances) beetween ¹³³Cs and ⁶Li are necessary. Additionally, the extremely large mass-difference of Li and Cs results in the smallest scaling factor of all alkali combinations for the appearance of universal Efimov states of 4.88 (in comparison to 22.7 for homo-nuclear mixtures) for ¹³³Cs₂⁶Li. A precise control over the scattering length enables the observation of a large series of this trimer states [1,2].

In this poster we present the structure of Feshbach resonances for a mixture of ¹³³Cs and ⁶Li that is calculated using the Asymptotic-Bound-State model [3]. We discuss the experimental approach used to study Efimov physics and other few body effects in this mixture.

[1] E. Braaten and H.-W. Hammer, AnnPhys 322, 120 (2007)

[2] K. Helfrich et al., PRA 81, 042715 (2010)

[3] T. G. Tiecke et al., PRA 82, 042712 (2010)