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Role of the intraspecies scattering length in the Efimov scenario with large mass difference by Häfner, Stephan; Ulmanis, Juris; Kuhnle, Eva D.; Wang, Yujun; Greene, Chris H.; Weidemüller, Matthias is a scholarly article available to read on EtoBox.

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We experimentally and theoretically study the effect of the intraspecies scattering length onto the heteronuclear Efimov scenario, following up on our earlier observation of Efimov resonances in an ultracold Cs-Li mixture for negative [Pires et al., Phys. Rev. Lett. 112, 250404 (2014)] and positive Cs-Cs scattering length [Ulmanis et al., Phys. Rev. Lett. 117, 153201 (2016)]. Three theoretical models of increasing complexity are employed to quantify its influence on the scaling factor and the three-body parameter: a simple Born-Oppenheimer picture, a zero-range theory, and a spinless van der Waals model. These models are compared to Efimov resonances observed in an ultracold mixture of bosonic $^{133}$Cs and fermionic $^6$Li atoms close to two Cs-Li Feshbach resonances located at 843 G and 889 G, characterized by different sign and magnitude of the Cs-Cs interaction. By changing the sign and magnitude of the intraspecies scattering length different scaling behaviors of the three-body loss rate are identified, in qualitative agreement with theoretical predictions. The three-body loss rate is strongly influenced by the intraspecies scattering length.

Author

Häfner, Stephan; Ulmanis, Juris; Kuhnle, Eva D.; Wang, Yujun; Greene, Chris H.; Weidemüller, Matthias

Published

2017

Language

EN