Search results for "LEVY FLIGHT"

showing 4 items of 4 documents

Switching times in long-overlap Josephson junctions subject to thermal fluctuations and non-Gaussian noise sources

2014

We investigate the superconducting lifetime of long current-biased Josephson junctions, in the presence of Gaussian and non-Gaussian noise sources. In particular, we analyze the dynamics of a Josephson junction as a function of the noise signal intensity, for different values of the parameters of the system and external driving currents. We find that the mean lifetime of the superconductive state is characterized by nonmonotonic behavior as a function of noise intensity, driving frequency and junction length. We observe that these nonmonotonic behaviours are connected with the dynamics of the junction phase string during the switching towards the resistive state. An important role is played…

DYNAMICSJosephson effectKRAMERS PROBLEMPhase (waves)Thermal fluctuationsFOS: Physical sciencesNoise processes and phenomenaSettore FIS/03 - Fisica Della MateriaPi Josephson junctionSuperconductivity (cond-mat.supr-con)symbols.namesakeLEVY FLIGHTSCALING LAWSCondensed Matter::SuperconductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)Stochastic analysis methodFluctuation phenomenaANOMALOUS DIFFUSIONENHANCED STABILITYSuperconductivityPhysicsRESONANT ACTIVATIONCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsNoise (signal processing)Condensed Matter - SuperconductivityBiasingJosephson deviceCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsZERO-VOLTAGE STATEGaussian noisesymbolsZERO-VOLTAGE STATE; ALPHA-STABLE NOISE; RESONANT ACTIVATION; LEVY FLIGHT; ANOMALOUS DIFFUSION; ENHANCED STABILITY; KRAMERS PROBLEM; SCALING LAWS; DYNAMICS; BEHAVIORALPHA-STABLE NOISEBEHAVIOR
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THE ROLE OF NON-GAUSSIAN SOURCES IN THE TRANSIENT DYNAMICS OF LONG JOSEPHSON JUNCTIONS

2013

We analyze the effects of different non-Gaussian noise sources on the transient dynamics of an overdamped long Josephson junction. We find nonmonotonic behavior of the mean escape time as a function of the noise intensity and frequency of the external driving signal for all the noise sources investigated.

Josephson effectPhysicsFluctuation phenomena random processes noise and Brownian motionCondensed matter physicsGaussianJosephson devicesDynamics (mechanics)General Physics and AstronomyJosephson energyComputational methods in statistical physics and nonlinear dynamicSettore FIS/03 - Fisica Della MateriaPi Josephson junctionsymbols.namesakeRandom walks and Levy flightsymbolsTransient (oscillation)
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Two competing species in super-diffusive dynamical regimes

2010

The dynamics of two competing species within the framework of the generalized Lotka-Volterra equations, in the presence of multiplicative alpha-stable Lévy noise sources and a random time dependent interaction parameter, is studied. The species dynamics is characterized by two different dynamical regimes, exclusion of one species and coexistence of both, depending on the values of the interaction parameter, which obeys a Langevin equation with a periodically fluctuating bistable potential and an additive alpha-stable Lévy noise. The stochastic resonance phenomenon is analyzed for noise sources asymmetrically distributed. Finally, the effects of statistical dependence between multiplicative …

Fluctuation phenomena random processes noise and Brownian motionPhysicsSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciBistabilityStochastic resonanceDifferential equationLotka–Volterra equationsProbability theory stochastic processes and statisticStochastic analysis methods (Fokker-Planck Langevin etc.)Population dynamicCondensed Matter PhysicsNoise (electronics)Multiplicative noiseElectronic Optical and Magnetic MaterialsBackground noiseLangevin equationRandom walks and Levy flightQuantitative Biology::Populations and EvolutionStatistical physicsThe European Physical Journal B
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Anomalous diffusion and nonlinear relaxation phenomena in stochastic models of interdisciplinary physics

2020

The study of nonlinear dynamical systems in the presence of both Gaussian and non-Gaussian noise sources is the topic of this research work. In particular, after shortly present new theoretical results for statistical characteristics in the framework of Markovian theory, we analyse four different physical systems in the presence of Levy noise source. (a) The residence time problem of a particle subject to a non-Gaussian noise source in arbitrary potential profile was analyzed and the exact analytical results for the statistical characteristics of the residence time for anomalous diffusion in the form of Levy flights in fully unstable potential profile was obtained. Noise enhanced stability …

Steady-state probability density function (PDF)Settore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciIdeal Chua memristorMemory devicesAnomalous diffusionLevy flightsBarrier crossing eventCorrelation time
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