Emergence of coherence in the Mott--superfluid quench of the Bose-Hubbard model

Details Emergence of coherence in the Mott--superfluid quench of the Bose-Hubbard model Emergence of coherence in the Mott--superfluid quench of the Bose-Hubbard model

2010-08-09

arxiv.org/abs/1008.1548v1

Physics

Quantum Physics

4 pages

Scientific paper

We study the quench from the Mott to the superfluid phase in the Bose-Hubbard model and investigate the spatial-temporal growth of phase coherence, i.e., phase locking between initially uncorrelated sites. To this end, we establish a hierarchy of correlations via a controlled expansion into inverse powers of the coordination number $1/Z$. It turns out that the off-diagonal long-range order spreads with a constant propagation speed, forming local condensate patches, whereas the phase correlator follows a diffusion-like growth rate.

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