Coherence and instability in a driven Bose-Einstein condensate: A fully dynamical number-conserving approach

Abstract

We consider a Bose-Einstein condensate driven by periodic δ-kicks. In contrast to first-order descriptions, which predict rapid, unbounded growth of the noncondensate in resonant parameter regimes, the consistent treatment of condensate depletion in our fully time-dependent, second-order description acts to damp this growth, leading to oscillations in the (non)condensate population and the coherence of the system. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.