63 citations · 707 across the 45 of their papers we have counts for
32 papers · 1 filter
Thermodynamics of photonic nonlinear Aharonov-Bohm cages
Stefano Iubini, Carlo Danieli
We investigate equilibrium and non-equilibrium thermodynamics of one-dimensional photonic diamond lattices with Kerr nonlinearity. The equilibrium phase diagram is obtained as a fu…
Dephasing-induced relaxation in tight-binding chains with linear and nonlinear defects
Debraj Das, Andrea Gambassi, Stefano Iubini +1
We investigate thermalization in a tight-binding chain with an on-site defect subject to local dephasing noise implemented as random phase kicks. For a single linear defect of stre…
Mean-field theory of the DNLS equation at positive and negative absolute temperatures
Michele Giusfredi, Stefano Iubini, Antonio Politi +1
The Discrete Non Linear Schrödinger (DNLS) model, due to the existence of two conserved quantities, displays an equilibrium transition between a homogeneous phase at positive absol…
Infinite-temperature thermostats by energy localization in a nonequilibrium setup
Michele Giusfredi, Stefano Iubini, Antonio Politi +1
Some lattice models having two conservation laws may display an equilibrium phase transition from a homogeneous (positive temperature - PT) to a condensed (negative temperature) ph…
Localization and "classical entanglement'' in the Discrete Non-Linear Schrödinger Equation
Martina Giachello, Stefano Iubini, Roberto Livi +1
We perform a detailed numerical study of the very peculiar thermodynamic properties of the localized high-energy phase of the Discrete Non-Linear Schrödinger Equation (DNLSE). A nu…
Effective grand-canonical description of condensation in negative-temperature regimes
Stefano Iubini, Antonio Politi
The observation of negative-temperature states in the localized phase of the Discrete Nonlinear Schrödinger (DNLS) equation has challenged statistical mechanics for a long time. Fo…
Localization in boundary-driven lattice models
Michele Giusfredi, Stefano Iubini, Paolo Politi
Several systems display an equilibrium condensation transition, where a finite fraction of a conserved quantity is spatially localized. The presence of two conservation laws may in…
Onsager coefficients in a coupled-transport model displaying a condensation transition
Stefano Iubini, Antonio Politi, Paolo Politi
We study nonequilibrium steady states of a one-dimensional stochastic model, originally introduced as an approximation of the Discrete Nonlinear Schrödinger equation. This model is…
Relaxation dynamics and finite-size effects in a simple model of condensation
Gabriele Gotti, Stefano Iubini, Paolo Politi
We consider a simple, purely stochastic model characterized by two conserved quantities (mass density and energy density ) which is known to display a condensation transitio…
Condensation induced by coupled transport processes
Gabriele Gotti, Stefano Iubini, Paolo Politi
Several lattice models display a condensation transition in real space when the density of a suitable order parameter exceeds a critical value. We consider one of such models with…
Frozen dynamics of a breather induced by an adiabatic invariant
Antonio Politi, Paolo Politi, Stefano Iubini
The Discrete Nonlinear Schrödinger (DNLS) equation is a Hamiltonian model displaying an extremely slow relaxation process when discrete breathers appear in the system. In [Iubini S…
Hydrodynamics and transport in the long-range-interacting chain
Stefano Iubini, Stefano Lepri, Stefano Ruffo
We present a simulation study of the one-dimensional lattice theory with long-range interactions decaying as an inverse power of the intersite distance , $σ>0…
Condensation transition and ensemble inequivalence in the Discrete Nonlinear Schrödinger Equation
Giacomo Gradenigo, Stefano Iubini, Roberto Livi +1
The thermodynamics of the discrete nonlinear Schrödinger equation in the vicinity of infinite temperature is explicitly solved in the microcanonical ensemble by means of large-devi…
Statistical Mechanics of Systems with Negative Temperature
Marco Baldovin, Stefano Iubini, Roberto Livi +1
Do negative absolute temperatures matter physics and specifically Statistical Physics? We provide evidence that we can certainly answer positively to this vexata quaestio. The grea…
Negative-temperature Fourier transport in one-dimensional systems
Marco Baldovin, Stefano Iubini
We investigate nonequilibrium steady states in a class of one-dimensional diffusive systems that can attain negative absolute temperatures. The cases of a paramagnetic spin system,…
Finite-size localization scenarios in condensation transitions
Gabriele Gotti, Stefano Iubini, Paolo Politi
We consider the phenomenon of condensation of a globally conserved quantity distributed on sites, occurring when the density exceeds a critical de…
Dephasing-assisted macrospin transport
S. Iubini, S. Borlenghi, A. Delin +2
Transport phenomena are ubiquitous in physics, and it is generally understood that the environmental disorder and noise deteriorates the transfer of excitations. There are however…
Localization transition in the Discrete Non-Linear Schrödinger Equation: ensembles inequivalence and negative temperatures
Giacomo Gradenigo, Stefano Iubini, Roberto Livi +1
We present a detailed account of a first-order localization transition in the Discrete Nonlinear Schrödinger Equation, where the localized phase is associated to the high energy re…
Coupled transport in a linear-stochastic Schrödinger Equation
Stefano Iubini
I study heat and norm transport in a one-dimensional lattice of linear Schrödinger oscillators with conservative stochastic perturbations. Its equilibrium properties are the same o…
Rate dependence of current and fluctuations in jump models with negative differential mobility
Gianluca Teza, Stefano Iubini, Marco Baiesi +2
Negative differential mobility is the phenomenon in which the velocity of a particle decreases when the force driving it increases. We study this phenomenon in Markov jump models w…
Equilibrium time-correlation functions of the long-range interacting Fermi-Pasta-Ulam model
Pierfrancesco Di Cintio, Stefano Iubini, Stefano Lepri +1
We present a numerical study of dynamical correlations (structure factors) of the long-range generalization of the Fermi-Pasta-Ulam oscillator chain, where the strength of the inte…
Dynamical freezing of relaxation to equilibrium
Stefano Iubini, Liviu Chirondojan, Gian-Luca Oppo +2
We provide evidence of an extremely slow thermalization occurring in the Discrete NonLinear Schrödinger (DNLS) model. At variance with many similar processes encountered in statist…
Heat transport in oscillator chains with long-range interactions coupled to thermal reservoirs
Stefano Iubini, Pierfrancesco Di Cintio, Stefano Lepri +2
We investigate thermal conduction in arrays of long-range interacting rotors and Fermi-Pasta-Ulam (FPU) oscillators coupled to two reservoirs at different temperatures. The strengt…
A Chain, a Bath, a Sink and a Wall
Stefano Iubini, Stefano Lepri, Roberto Livi +2
We investigate out-of-equilibrium stationary processes emerging in a Discrete Nonlinear Schroedinger chain in contact with a heat reservoir (a bath) at temperature and a pure…