title: Nonlinear resonances in delta-kicked Bose-Einstein condensates.
abstract: We investigate the effect of atomic interactions on delta-kicked cold atoms. We show that the clearest signature of the nonlinear dynamics is a surprisingly abrupt cutoff that appears on the leading resonances. We show that this is due to an excitation path combining both Beliaev and Landau processes, with some analogies to nonlinear self-trapping. Investigation of dynamical instability reveals further symptoms of nonlinearity such as a regime of exponential oscillations.
authors.affiliation: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom. t.monteiro@ucl.ac.uk
authors.forename: T S
authors.initials: TS
authors.lastname: Monteiro
authors.forename: A
authors.initials: A
authors.lastname: Rançon
authors.forename: J
authors.initials: J
authors.lastname: Ruostekoski