295 citations · 4.5k across the 94 of their papers we have counts for
36 papers · 1 filter
Haldane Model at finite temperature
Luca Leonforte, Davide Valenti, Bernardo Spagnolo +2
We consider the Haldane model, a 2D topological insulator whose phase is defined by the Chern number. We study its phases as temperature varies by means of the Uhlmann number, a fi…
Dissipative dynamics in a quantum bistable system: Crossover from weak to strong damping
Luca Magazzù, Davide Valenti, Bernardo Spagnolo +1
The dissipative dynamics of a quantum bistable system coupled to a Ohmic heat bath is investigated beyond the spin-boson approximation. Within the path-integral approach to quantum…
Temperature dependence of spin depolarization of drifting electrons in n-type GaAs bulks
Stefano Spezia, Dominique Persano Adorno, Nicola Pizzolato +1
The influence of temperature and transport conditions on the electron spin relaxation in lightly doped n-type GaAs semiconductors is investigated. A Monte Carlo approach is used to…
Stability measures in metastable states with Gaussian colored noise
Alessandro Fiasconaro, Bernardo Spagnolo
We present a study of the escape time from a metastable state of an overdamped Brownian particle, in the presence of colored noise generated by Ornstein-Uhlenbeck process. We analy…
Stochastic dynamics and mean field approach in a system of three interacting species
Davide Valenti, Bernardo Spagnolo
The spatio-temporal dynamics of three interacting species, two preys and one predator, in the presence of two different kinds of noise sources is studied. To describe the spatial d…
The problem of analytical calculation of barrier crossing characteristics for Levy flights
A. A. Dubkov, A. La Cognata, B. Spagnolo
By using the backward fractional Fokker-Planck equation we investigate the barrier crossing event in the presence of Levy noise. After shortly review recent results obtained with d…
Noise driven translocation of short polymers in crowded solutions
N. Pizzolato, A. Fiasconaro, B. Spagnolo
In this work we study the noise induced effects on the dynamics of short polymers crossing a potential barrier, in the presence of a metastable state. An improved version of the Ro…
Noise effects in polymer dynamics
N. Pizzolato, A. Fiasconaro, B. Spagnolo
The study of the noise induced effects on the dynamics of a chain molecule crossing a potential barrier, in the presence of a metastable state, is presented. A two-dimensional stoc…
Levy Flight Superdiffusion: An Introduction
A. A. Dubkov, B. Spagnolo, V. V. Uchaikin
After a short excursion from discovery of Brownian motion to the Richardson "law of four thirds" in turbulent diffusion, the article introduces the Lévy flight superdiffusion as a…
Critical Phenomena and Diffusion in Complex Systems
Bernardo Spagnolo, Alexander A. Dubkov
Editorial of the International Conference on Critical Phenomena and Diffusion in Complex Systems held on 5--7 December, 2006 in Nizhniy Novgorod State University, Russia and was de…
Verhulst model with Levy white noise excitation
A. A. Dubkov, B. Spagnolo
The transient dynamics of the Verhulst model perturbed by arbitrary non-Gaussian white noise is investigated. Based on the infinitely divisible distribution of the Levy process we…
Langevin Approach to Levy Flights in Fixed Potentials: Exact Results for Stationary Probability Distributions
A. A. Dubkov, B. Spagnolo
The functional method to derive the fractional Fokker-Planck equation for probability distribution from the Langevin equation with Levy stable noise is proposed. For the Cauchy sta…
Extinction statistics in N random interacting species
Alessandro Fiasconaro, Bernardo Spagnolo
A randomly interacting N-species Lotka-Volterra system in the presence of a Gaussian multiplicative noise is analyzed. The investigation is focused on the role of this external noi…
Lifetime of metastable states and suppression of noise in Interdisciplinary Physical Models
B. Spagnolo, A. A. Dubkov, A. L. Pankratov +3
Transient properties of different physical systems with metastable states perturbed by external white noise have been investigated. Two noise-induced phenomena, namely the noise en…
Mean Escape Time in a System with Stochastic Volatility
Giovanni Bonanno, Davide Valenti, Bernardo Spagnolo
We study the mean escape time in a market model with stochastic volatility. The process followed by the volatility is the Cox Ingersoll and Ross process which is widely used to mod…
Moment equations in a Lotka-Volterra extended system with time correlated noise
D. Valenti, L. Schimansky-Geier, X. Sailer +2
A spatially extended Lotka-Volterra system of two competing species in the presence of two correlated noise sources is analyzed: (i) an external multiplicative time correlated nois…
Nonmonotonic Pattern Formation in Three Species Lotka-Volterra System with Colored Noise
A. Fiasconaro, D. Valenti, B. Spagnolo
A coupled map lattice of generalized Lotka-Volterra equations in the presence of colored multiplicative noise is used to analyze the spatiotemporal evolution of three interacting s…
A Simple Noise Model with Memory for Biological Systems
O. Chichigina, D. Valenti, B. Spagnolo
A noise source model, consisting of a pulse sequence at random times with memory, is presented. By varying the memory we can obtain variable randomness of the stochastic process. T…
Diffusion in Flashing Periodic Potentials
Bernardo Spagnolo, Alexander Dubkov
The one-dimensional overdamped Brownian motion in a symmetric periodic potential modulated by external time-reversible noise is analyzed. The calculation of the effective diffusion…
Moment Equations for a Spatially Extended System of Two Competing Species
D. Valenti, L. Schimansky-Geier, X. Sailer +1
The dynamics of a spatially extended system of two competing species in the presence of two noise sources is studied. A correlated dichotomous noise acts on the interaction paramet…
Role of Noise in a Market Model with Stochastic Volatility
G. Bonanno, D. Valenti, B. Spagnolo
We study a generalization of the Heston model, which consists of two coupled stochastic differential equations, one for the stock price and the other one for the volatility. We con…
Signatures of Noise Enhanced Stability in Metastable States
A. Fiasconaro, B. Spagnolo, S. Boccaletti
The lifetime of a metastable state in the transient dynamics of an overdamped Brownian particle is analyzed, both in terms of the mean first passage time and by means of the mean g…
Suppression of timing errors in short overdamped Josephson junctions
Andrey L. Pankratov, Bernardo Spagnolo
The influence of fluctuations and periodical driving on temporal characteristics of short overdamped Josephson junction is analyzed. We obtain the standard deviation of the switchi…
Transient behavior of a population dynamical model
B. Spagnolo, D. Valenti, A. Fiasconaro
The transient behavior of an ecosystem with N random interacting species in the presence of a multiplicative noise is analyzed. The multiplicative noise mimics the interaction with…