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Unusual keynote talk at an international scientific conference
NCCR MUST at Scientifica 2021Efimov physics and beyond: Universal few-body phenomena in an ultracold gas of cesium atoms
| Date | Do, 18.10.2012 | |
| Time | 10.15 | |
| Speaker | Dr. Martin Berninger, Institute for Experimental Physics, University of Innsbruck, Austria | |
| Location | Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern | |
| Program | Ultracold atomic gases are versatile systems to study fundamental questions of few-body physics due to the full control over their external and internal degrees of freedom. In particular, cesium represents, due to its favourable scattering properties, a prime model system for exploring universal few-body physics. The main part of this talk covers experimental results connected to the Efimov scenario. This scenario predicts the existence of an infinite series of universally related three-body bound (Efimov) states for resonant two-body interactions. We observed resonance phenomena originating from the coupling of Efimov states to the atomic or atom-dimer continuum. These experimental results agree with the main predictions of universal theory. Recent experimental findings demonstrate that three-body universality persists even when different Feshbach resonances are involved in the tuning of the s-wave scattering length. This result suggests an underlying connection between Efimov and two-body physics. In a major extension of Efimov physics, a “family” of universally related cluster states tied to an Efimov trimer was predicted. We experimentally observed four- and even five-body cluster states, providing crucial evidence for the existence of such a “family”. | |
| Link | www.iap.unibe.ch | |
