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Efimov physics and beyond: Universal few-body phenomena in an ultracold gas of cesium atoms

Date Do, 18.10.2012 - 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”.
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