55 citations · 124 across the 5 of their papers we have counts for
5 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…
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…