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cond-mat.soft2004★ 19 cited
Strong-coupling expansions for the topologically inhomogeneous Bose-Hubbard model
P. Buonsante, V. Penna, A. Vezzani
We consider a Bose-Hubbard model with an arbitrary hopping term and provide the boundary of the insulating phase thereof in terms of third-order strong coupling perturbative expans…
cond-mat.soft2004★ 14 cited
Topology-induced confined superfluidity in inhomogeneous arrays
P. Buonsante, R. Burioni, D. Cassi +2
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 superflui…