Analysis of soliton dynamics and noise induced effects on the superconductive lifetime in long Josephson junctions.

Risultato della ricerca: Other contribution

Abstract

The influence of various noise sources on the transient dynamics of long Josephson junctions (LJJ) is investigated in the presence of an oscillating bias current signal and a noise source with Gaussian or non-Gaussian (i.e. Cauchy-Lorentz or Lévy-Smirnov) probability distributions. These systems are computationally analyzed integrating the perturbed Sine-Gordon equation describing the phase evolution. We found evidence of noise induced effects on trends of the mean escape time (MET) from the superconductive metastable state, varying different system parameters, as the bias frequency, noise intensity and junction length. In particular, we find resonant activation (RA) and noise enhanced stability (NES), and we study the connections between these phenomena and the creation/evolution of solitons (i.e. kink and antikink solutions) in the LJJ phase string dynamics. Pronounced changes in RA and NES are observed by using Lévy noise sources with different statistics. MET is also studied considering spatially homogeneous and inhomogeneous bias current distributions. In the latter case, in the presence of Gaussian noise, we observe an enhanced non-monotonic behavior, that, conversely, almost vanishes using noise sources with different statistics.
Lingua originaleEnglish
Stato di pubblicazionePublished - 2013

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Josephson junctions
solitary waves
life (durability)
escape
statistics
activation
noise intensity
current distribution
random noise
metastable state
strings
trends

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@misc{63d671a19fe348b7b35eedb7906ce44e,
title = "Analysis of soliton dynamics and noise induced effects on the superconductive lifetime in long Josephson junctions.",
abstract = "The influence of various noise sources on the transient dynamics of long Josephson junctions (LJJ) is investigated in the presence of an oscillating bias current signal and a noise source with Gaussian or non-Gaussian (i.e. Cauchy-Lorentz or L{\'e}vy-Smirnov) probability distributions. These systems are computationally analyzed integrating the perturbed Sine-Gordon equation describing the phase evolution. We found evidence of noise induced effects on trends of the mean escape time (MET) from the superconductive metastable state, varying different system parameters, as the bias frequency, noise intensity and junction length. In particular, we find resonant activation (RA) and noise enhanced stability (NES), and we study the connections between these phenomena and the creation/evolution of solitons (i.e. kink and antikink solutions) in the LJJ phase string dynamics. Pronounced changes in RA and NES are observed by using L{\'e}vy noise sources with different statistics. MET is also studied considering spatially homogeneous and inhomogeneous bias current distributions. In the latter case, in the presence of Gaussian noise, we observe an enhanced non-monotonic behavior, that, conversely, almost vanishes using noise sources with different statistics.",
author = "Claudio Guarcello",
year = "2013",
language = "English",
type = "Other",

}

TY - GEN

T1 - Analysis of soliton dynamics and noise induced effects on the superconductive lifetime in long Josephson junctions.

AU - Guarcello, Claudio

PY - 2013

Y1 - 2013

N2 - The influence of various noise sources on the transient dynamics of long Josephson junctions (LJJ) is investigated in the presence of an oscillating bias current signal and a noise source with Gaussian or non-Gaussian (i.e. Cauchy-Lorentz or Lévy-Smirnov) probability distributions. These systems are computationally analyzed integrating the perturbed Sine-Gordon equation describing the phase evolution. We found evidence of noise induced effects on trends of the mean escape time (MET) from the superconductive metastable state, varying different system parameters, as the bias frequency, noise intensity and junction length. In particular, we find resonant activation (RA) and noise enhanced stability (NES), and we study the connections between these phenomena and the creation/evolution of solitons (i.e. kink and antikink solutions) in the LJJ phase string dynamics. Pronounced changes in RA and NES are observed by using Lévy noise sources with different statistics. MET is also studied considering spatially homogeneous and inhomogeneous bias current distributions. In the latter case, in the presence of Gaussian noise, we observe an enhanced non-monotonic behavior, that, conversely, almost vanishes using noise sources with different statistics.

AB - The influence of various noise sources on the transient dynamics of long Josephson junctions (LJJ) is investigated in the presence of an oscillating bias current signal and a noise source with Gaussian or non-Gaussian (i.e. Cauchy-Lorentz or Lévy-Smirnov) probability distributions. These systems are computationally analyzed integrating the perturbed Sine-Gordon equation describing the phase evolution. We found evidence of noise induced effects on trends of the mean escape time (MET) from the superconductive metastable state, varying different system parameters, as the bias frequency, noise intensity and junction length. In particular, we find resonant activation (RA) and noise enhanced stability (NES), and we study the connections between these phenomena and the creation/evolution of solitons (i.e. kink and antikink solutions) in the LJJ phase string dynamics. Pronounced changes in RA and NES are observed by using Lévy noise sources with different statistics. MET is also studied considering spatially homogeneous and inhomogeneous bias current distributions. In the latter case, in the presence of Gaussian noise, we observe an enhanced non-monotonic behavior, that, conversely, almost vanishes using noise sources with different statistics.

UR - http://hdl.handle.net/10447/83743

M3 - Other contribution

ER -