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arXiv · cond-mat/0611126

Coexistence of superfluid and Mott phases of lattice bosons

R. A. Barankov·C. Lannert·S. Vishveshwara
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Abstract

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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R. A. Barankov, C. Lannert, S. Vishveshwara. 2006-11-06. Coexistence of superfluid and Mott phases of lattice bosons. https://doi.org/10.1103/physreva.75.063622

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