Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 15: Ultracold atoms and BEC - III (with Q)

A 15.1: Talk

Tuesday, March 7, 2017, 14:30–14:45, N 1

Efimov physics in ultracold atomic gases using finite-range potentials — •Thomas Secker, Paul Mestrom, and Servaas Kokkelmans — Eindhoven University of Technology, Eindhoven, The Netherlands

Three-body Efimov physics is relevant for the understanding of both dynamics and stability of ultracold gases. Efimov predicted the existence of an infinite sequence of three-body bound states, of which many properties scale universally, at diverging scattering length for a zero-range interaction potential. Experiments with ultracold atoms in which the scattering length is tuned through Feshbach resonances have also shown the universality of the negative three-body parameter. In order to investigate these universal aspects, we utilize a finite range interaction potential. We solve for this problem in a momentum-space treatment containing off-shell two-body scattering processes. To include the Feshbach formalism we have generalized it to an off-shell theory. First results show remarkable similarities with experimental data, especially in the case of broad resonances.