Topology-induced confined superfluidity in inhomogeneous arrays
arXiv:cond-mat/0405520 · doi:10.1103/PhysRevB.70.224510
Abstract
We report the first 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 behaviour of the bosonic system is confined along the comb backbone. The existence of such {\it 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 system exhibiting macroscopic phase coherence, such as coupled Bose condensates and Josephson arrays.
6 pages, 4 figures, final version
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Cited by in corpus (5)
- Extended Bose Hubbard model of interacting bosonic atoms in optical lattices: from superfluidity to density waves
- Quantum phase transitions of interacting bosons on hyperbolic lattices
- How creating one additional well can generate Bose-Einstein condensation
- Bose-Einstein condensation in exotic lattice geometries
- Quantum Coherence in Loopless Superconductive Networks