Hamburg 2009 – scientific programme

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A: Fachverband Atomphysik

A 14: Ultra-Cold Atoms, Ions and BEC I (with Q)

A 14.4: Talk

Tuesday, March 3, 2009, 17:45–18:00, VMP 6 HS-C

Atom-Dimer Scattering in Ultracold Gases — •Kerstin Helfrich and Hans-Werner Hammer — Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany

Three-body systems with large scattering length display so-called Efimov physics -- universal phenomena associated with a discrete scaling symmetry. These phenomena include resonant enhancement of three-body loss rates when an Efimov resonance is at the scattering threshold. In particular, there can be resonant peaks in the atom-dimer relaxation rate for large positive scattering length.

We compute the atom-dimer relaxation rate as a function of temperature using calculations of the atom-dimer scattering phase shifts from effective field theory. A comparison to experimental data is shown.