223 citations · 1.2k across the 35 of their papers we have counts for
35 papers
On the dispute between Boltzmann and Gibbs entropy
Pierfrancesco Buonsante, Roberto Franzosi, Augusto Smerzi
Very recently, the validity of the concept of negative temperature has been challenged by several authors since they consider Boltzmann's entropy (that allows negative temperatures…
Phase transitions at high energy vindicate negative microcanonical temperature
Pierfrancesco Buonsante, Roberto Franzosi, Augusto Smerzi
The notion of negative absolute temperature emerges naturally from Boltzmann's definition of "surface" microcanonical entropy in isolated systems with a bounded energy density. Rec…
Dynamic Phase Diagram for the Quantum Phase Model
Pierfrancesco Buonsante, Luca Orefice, Augusto Smerzi
We address the stability of superfluid currents in a system of interacting lattice bosons. We consider various Gutzwiller trial states for the quantum phase model which provides a…
Quantum Criticality in a Bosonic Josephson Junction
P. Buonsante, R. Burioni, E. Vescovi +1
In this paper we consider a bosonic Josephson junction described by a two-mode Bose-Hubbard model, and we thoroughly analyze a quantum phase transition occurring in the system in t…
Dipolar bosons on an optical lattice ring
Michal Maik, Pierfrancesco Buonsante, Alessandro Vezzani +1
We consider an ultra-small system of polarized bosons on an optical lattice with a ring topology interacting via long range dipole-dipole interactions. Dipoles polarized perpendicu…
Dynamical bifurcation as a semiclassical counterpart of a quantum phase transition
Pierfrancesco Buonsante, Vittorio Penna, Alessandro Vezzani
We illustrate how dynamical transitions in nonlinear semiclassical models can be recognized as phase transitions in the corresponding -- inherently linear -- quantum model, where,…