87 citations · 277 across the 11 of their papers we have counts for
11 papers
An algebraic approach to the study of weakly excited states for a condensate in a ring geometry
P. Buonsante, R. Franco, V. Penna
We determine the low-energy spectrum and the eigenstates for a two-bosonic mode nonlinear model by applying the Inönü-Wigner contraction method to the Hamiltonian algebra. This mod…
Fractional-filling Mott domains in two dimensional optical superlattices
Pierfrancesco Buonsante, Vittorio Penna, Alessandro Vezzani
Ultracold bosons in optical superlattices are expected to exhibit fractional-filling insulating phases for sufficiently large repulsive interactions. On strictly 1D systems, the ex…
Cell strong coupling perturbative approach to the phase diagram of ultracold bosons in optical superlattices
Pierfrancesco Buonsante, Alessandro Vezzani
The phase diagram of ultracold bosons in realistic optical superlattices is addressed via second-order {\it cell} strong coupling perturbative expansions for the Bose-Hubbard model…
Analytical mean-field approach to the phase-diagram of ultracold bosons in optical superlattices
P. Buonsante, V. Penna, A. Vezzani
We report a multiple-site mean-field analysis of the zero-temperature phase diagram for ultracold bosons in realistic optical superlattices. The system of interacting bosons is des…
Fractional-filling loophole insulator domains for ultracold bosons in optical superlattices
Pierfrancesco Buonsante, Vittorio Penna, Alessandro Vezzani
The zero-temperature phase diagram of a Bose-Einstein condensate confined in realistic one-dimensional -periodic optical superlattices is investigated. The system of interact…
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…