Oscillating Superfluidity of Bosons in Optical Lattices
Oscillating Superfluidity of Bosons in Optical Lattices
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 …