Frankfurt 2006 – scientific programme

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PV: Plenarvorträge

PV III

PV III: Plenary Talk

Tuesday, March 14, 2006, 08:30–09:15, HV

Two, three, many: Interaction effects in the ultracold quantum world — •Rudi Grimm — Institut für Experimentalphysik und Institut für Quantenoptik und Quanteninformation der Österreichischen Akademie der Wissenschaften, Innsbruck, Austria

Ultracold gases with tunable interactions have opened up unprecedented possibilities to experimentally explore phenomena of two-body, few-body, and many-body quantum physics. I will discuss recent developments which have allowed us to enter novel exciting regimes of interactions in quantum gases. First, I will discuss the formation of ultracold dimer molecules in bosonic and fermionic gases by means of magnetically tuned Feshbach resonances [1]. I will then report on the experimental observation of an “Efimov resonance” in an ultracold gas of cesium atoms [2]. The striking resonance represents the first experimental evidence ever obtained for the Efimov trimer state, the observation of which has been an elusive goal for more than three decades. I will finally enter the regime of many-body systems by discussing the physics of strongly interacting fermionic quantum gases, representing high-Tc superfluids in the BEC-BCS crossover regime [3].

[1] J. Herbig, Science 301, 1510 (2003).

[2] T. Kraemer et al., cond-mat/0511xxx.

[3] C. Chin et al., Science 305, 1128 (2004).