Resonant atom-dimer relaxation in ultracold atomsK. 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.
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