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SYEP: Symposium Efimov Physics

SYEP 2: Symposium Efimov Physics II

SYEP 2.5: Talk

Monday, March 23, 2015, 16:00–16:15, C/gHS

Efimov physics in an ultracold Bose-Fermi mixture of ¹³³Cs and ⁶Li — •Juris Ulmanis, Rico Pires, Stephan Häfner, Alda Arias, Eva D. Kuhnle, and Matthias Weidemüller — Physikalisches Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany

Ultracold Bose-Fermi mixture of Cs and Li constitute a prototypical system with mass imbalance that allows exploration of many intriguing phenomena in few- and many-body physics. One of such is the heteronuclear Efimov effect, due to which an infinite geometrical series of bound three-body states can be formed, given that the two-body interactions are resonant. Here we present the recent observations of two consecutive Efimov resonances through measurements of three-body loss coefficients near the broad Feshbach resonance [1]. In order to precisely map the applied magnetic field onto the scattering length we extend our previous analysis of Feshbach resonances [2] with radio-frequency association of LiCs Feshbach molecules. We measure the dimer binding energies close to Feshbach resonances and extract Li-Cs scattering properties from them. The new mapping allows us to obtain refined positions and scaling of the Efimov resonances, which slightly deviates from the predicted universal scaling factor for the LiCs system.

[1] R. Pires et al., PRL 112, 250404 (2014)

[2] R. Pires et al., PRA 90, 012710 (2014)