Theory of nonlinear oscillating dipolar excitations in one-dimensional condensates

Abstract

We find that for a one-dimensional condensate in the presence of an applied ac field, a significant absorption peak should occur for values of the external frequency just below the pinning frequency ${\ensuremath{\omega}}_{F}$. This power absorption is due to those nonlinear normal modes of the condensate known as "breathers," which are shown to phase lock with the applied field.