Volume 86, Number 5, June 2009
Article Number 53003
Number of page(s) 5
Section Atomic, Molecular and Optical Physics
Published online 24 June 2009
EPL, 86 (2009) 53003
DOI: 10.1209/0295-5075/86/53003

Resonant atom-dimer relaxation in ultracold atoms

K. Helfrich and H.-W. Hammer

Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn - 53115 Bonn, Germany, EU

received 23 February 2009; accepted in final form 26 May 2009; published June 2009
published online 24 June 2009

Three-body systems with large scattering length display universal phenomena associated with a discrete scaling symmetry. These phenomena include resonant enhancement of three-body loss rates when an Efimov three-body 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 improve upon earlier studies and calculate the atom-dimer relaxation rate as a function of temperature using a Bose-Einstein distribution for the thermal average. As input, we use calculations of the atom-dimer scattering phase shifts from effective field theory.

34.50.-s - Scattering of atoms and molecules.
21.45.-v - Few-body systems.
67.85.-d - Ultracold gases, trapped gases.

© EPLA 2009