Coexistence of superfluid and Mott phases of lattice bosons

Details Coexistence of superfluid and Mott phases of lattice bosons Coexistence of superfluid and Mott phases of lattice bosons

2006-11-06

arxiv.org/abs/cond-mat/0611126v1

Phys. Rev. A 75, 063622 (2007)

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevA.75.063622

Recent experiments on strongly-interacting bosons in optical lattices have revealed the co-existence of spatially-separated Mott-insulating and number-fluctuating phases. The description of this inhomogeneous situation is the topic of this Letter. We establish that the number-fluctuating phase forms a superfluid trapped between the Mott-insulating regions and derive the associated collective mode structure. We discuss the interlayer's crossover between two- and three-dimensional behavior as a function of the lattice parameters and estimate the critical temperatures for the transition of the superfluid phase to a normal phase.

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