Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Ultra-cold atoms, ions and BEC IV (with Q)

A 17.5: Vortrag

Mittwoch, 16. März 2011, 17:30–17:45, BAR 205

New Efimov resonances in an ultracold cesium gas — •Alessandro Zenesini1, Martin Berninger1, Bo Huang1,2, Stefan Besler1, Hanns-Christoph Nägerl1, Francesca Ferlaino1, and Rudolf Grimm1,21Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria

Efimov trimer states represent the paradigm of universality in few-body physics. Although these exotic three-body weakly-bound states have been experimentally investigated in an increasing number of ultracold atomic systems, many fundamental aspects remain unclear [1]. An intriguing open question is related to how short-range physics influences the Efimov effect in real systems. Short range contributions are commonly included in universal theory via a single parameter, known as "three-body parameter". An open question is whether this parameter is constant or whether it can vary significantly when Feshbach resonances are employed for interaction tuning. Cesium is a very promising candidate to address this issue because of the many broad and narrow Feshbach resonances with different partial-wave character. Our experimental results reveal new Efimov features close to different Feshbach resonances and shed new light on the three-body parameter.

[1] ''Forty years of Efimov physics: How a bizarre prediction turned into a hot topic'' F. Ferlaino and R. Grimm, Physics 3, 9 (2010)

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