Topology-induced confined superfluidity in inhomogeneous arrays

Year: 2004

Authors: Buonsante P., Burioni R., Cassi D., Penna V., Vezzani A.

Autors Affiliation: Dipartimento di Fisica and INFM, Politecnico di Torino; Dipartimento di Fisica and INFM, Università degli Studi di Parma

Abstract: We report a study of the zero-temperature phase diagram of the Bose-Hubbard model on topologically inhomogeneous arrays. We show that the usual Mott-insulator and superfluid domains, in the paradigmatic case of the comb lattice, are separated by regions where the superfluid behavior of the bosonic system is confined along the comb backbone. The existence of such confined superfluidity, arising from topological inhomogeneity, is proved by different analytical and numerical techniques which we extend to the case of inhomogeneous arrays. We also discuss the relevance of our results to real systems exhibiting macroscopic phase coherence, such as coupled Bose condensates and Josephson arrays.

Journal/Review: PHYSICAL REVIEW B

Volume: 70 (22)      Pages from: 224510  to: 224510

KeyWords: coupled bose einstein condensate; quantum phase transitions; topological inhomogeneity
DOI: 10.1103/PhysRevB.70.224510

ImpactFactor: 3.075
Citations: 10
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