Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 63: Ultra-cold atoms, ions and BEC IV

Q 63.7: Vortrag

Freitag, 16. März 2012, 12:15–12:30, V57.03

Efimov trimers and universal N-body states — •Alessandro Zenesini1, B. Huang1,2, M. Berninger1, S. Besler1, H.-C Naegerl1, F. Ferlaino1, and R. Grimm1,21Institut fuer Experimentalphysik, Universitaet Innsbruck, 6020 Innsbruck, Austria — 2Institut fuer Quantenoptik und Quanteninformation, OEsterreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria

An atomic system becomes "universal" when the scattering length is tuned to large values and the low-energy physics is independent on the details of interaction potential. Efimov trimers and tetramers are two of the most striking examples of universal systems observed in experiment on ultracold atoms [1]. Open questions are whether universality is preserved when different Feshbach resonances are employed for interaction tuning or when another body is added to the system. Our latest results show not only that universality survives across Feshbach resonances but also that hints of a five-body bound state can be observed, in agreement with theoretical predictions of universal N-body states [2].

[1] ``Forty years of Efimov physics: How a bizarre prediction turned into a hot topic'' F. Ferlaino and R. Grimm, Physics 3, 9 (2010) [2] ``General Theoretical Description of N-Body Recombination" N. P. Mehta et al, PRL 103, 153201 (2009)

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