Non-equilibrium coherence dynamics of a soft boson lattice

Details Non-equilibrium coherence dynamics of a soft boson lattice Non-equilibrium coherence dynamics of a soft boson lattice

2005-04-28

arxiv.org/abs/cond-mat/0504762v2

Physics

Condensed Matter

Other Condensed Matter

10 pages. 4 figures

Scientific paper

10.1103/PhysRevA.74.051601

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.

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