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• W2013804345 abstract "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 expansions for the ground state energy. In the general case two previously unreported terms occur, arising from triangular loops and hopping inhomogeneities, respectively. Quite interestingly the latter involves the entire spectrum of the hopping matrix rather than its maximal eigenpair, like the remaining perturbative terms. We also show that hopping inhomogeneities produce a first order correction in the local density of bosons. Our results apply to ultracold bosons trapped in confining potentials with arbitrary topology, including the realistic case of optical superlattices with uneven hopping amplitudes. Significant examples are provided. Furthermore, our results can be extented to magnetically tuned transitions in Josephson junction arrays." @default.
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• W2013804345 date "2004-11-18" @default.
• W2013804345 modified "2023-10-18" @default.
• W2013804345 title "Strong-coupling expansions for the topologically inhomogeneous Bose-Hubbard model" @default.
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• W2013804345 doi "https://doi.org/10.1103/physrevb.70.184520" @default.
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