Dynamic effects of a Feshbach resonance on Bragg scattering from a Bose-Einstein condensate

Abstract

We present a theoretical model for Bragg scattering from a Bose-Einstein condensate (BEC) in the vicinity of a magnetic Feshbach resonance, using a two-c-field formalism, one c field for the atom and the other for a molecule formed of two atoms. We use this model to numerically simulate an experiment investigating the effects of strong interactions on the Bragg spectrum from a 85Rb BEC. Results from these simulations and from our previous calculations using an atom-molecule Bogoliubov approach are in very good quantitative agreement with the experimental results, confirming the importance of the resonance bound state in the dynamics of the condensate for fast experiments like Bragg scattering. © 2013 American Physical Society.