Phys. Rev. Lett. 89, 250404 (2002) [4 pages]Oscillating Superfluidity of Bosons in Optical LatticesReceived 11 June 2002; published 3 December 2002 Following a suggestion by Orzel et al. [ Science 291 2386 (2001)], we analyze bosons in an optical lattice undergoing a sudden parameter change from the Mott to superfluid phase. We introduce a modified coherent states path integral to describe both phases. The saddle point theory yields collective oscillations of the uniform superfluid order parameter. We calculate its damping rate by phason pair emission. In two dimensions the overdamped region largely overlaps with the quantum critical region. Measurements of critical dynamics on the Mott side are proposed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.250404
DOI:
10.1103/PhysRevLett.89.250404
PACS:
03.75.Fi, 05.30.Jp, 74.50.+r
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