223 citations · 1.2k across the 35 of their papers we have counts for
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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…
Attractive ultracold bosons in a necklace optical potential
Pierfrancesco Buonsante, Vittorio Penna, Alessandro Vezzani
We study the ground state properties of the Bose-Hubbard model with attractive interactions on a M-site one-dimensional periodic -- necklace-like -- lattice, whose experimental rea…
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…