Non-equilibrium coherence dynamics of a soft boson lattice
arXiv:cond-mat/0504762 · doi:10.1103/PhysRevA.74.051601
Abstract
We study the non-equilibrium evolution of the phase coherence of a Bose-Einstein condensate (BEC) in a one dimensional optical lattice, as the lattice is suddenly quenched from an insulating to a superfluid state. We observe slowly damped phase coherence oscillations in the regime of large filling factor (~100 bosons per site) at a frequency proportional to the generalized Josephson frequency. The truncated Wigner approximation (TWA) predicts the frequency of the observed oscillations.
10 pages. 4 figures