Noise-induced effects in nonlinear relaxation of condensed matter systems

Spagnolo, Bernardo; Valenti, Davide; Guarcello, Claudio; Carollo, Angelo; Adorno, Dominique Persano; Spezia, Stefano; Pizzolato, Nicola; Paola, Benedetto Di

doi:10.1016/j.chaos.2015.07.023

Cited by 119 publications

(50 citation statements)

References 123 publications

(167 reference statements)

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“…For this reason, the investigation of the spin relaxation processes represents a crucial point in spintronic device design [137,138]. Previous studies of the electron spin relaxation process in GaAs bulks have shown that external fluctuations added to the driving static electric field can affect the spin decoherence process [79,[82][83][84], being this effect critically dependent on the amplitude of both the applied electric field and the external fluctuations, as well as on the noise characteristic times.…”

Section: Spin Polarised Transportmentioning

confidence: 99%

“…In this mesoscopic device, which can be in a resistive or superconducting state, the current and the voltage across the junction are related to the microscopic order parameter ϕ, that is the phase difference between the wave functions describing the ground state in the two superconductors [17,79,90,91]. Recently, the effects of both thermal and non-Gaussian fluctuations on the dynamics of JJs have been the focus of increasing investigations [16,17,[92][93][94][95].…”

Section: Short and Long Jjmentioning

confidence: 99%

“…The dynamics of these devices is affected by environmental perturbations and, in particular, by random fluctuations responsible for decoherence phenomena. The effects of both thermal and non-thermal random fluctuations on the behavior of normal and graphene-based JJs were recently investigated [17,[79][80][81].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Relaxation Phenomena in Metastable Condensed Matter Systems

Spagnolo

Guarcello

Magazzù

et al. 2016

Entropy

100

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Nonlinear relaxation phenomena in three different systems of condensed matter are investigated. (i) First, the phase dynamics in Josephson junctions is analyzed. Specifically, a superconductor-graphene-superconductor (SGS) system exhibits quantum metastable states, and the average escape time from these metastable states in the presence of Gaussian and correlated fluctuations is calculated, accounting for variations in the the noise source intensity and the bias frequency. Moreover, the transient dynamics of a long-overlap Josephson junction (JJ) subject to thermal fluctuations and non-Gaussian noise sources is investigated. Noise induced phenomena are observed, such as the noise enhanced stability and the stochastic resonant activation. (ii) Second, the electron spin relaxation process in a n-type GaAs bulk driven by a fluctuating electric field is investigated. In particular, by using a Monte Carlo approach, we study the influence of a random telegraph noise on the spin polarized transport. Our findings show the possibility to raise the spin relaxation length by increasing the amplitude of the external fluctuations. Moreover, we find that, crucially, depending on the value of the external field strength, the electron spin depolarization length versus the noise correlation time increases up to a plateau. (iii) Finally, the stabilization of quantum metastable states by dissipation is presented. Normally, quantum fluctuations enhance the escape from metastable states in the presence of dissipation. We show that dissipation can enhance the stability of a quantum metastable system, consisting of a particle moving in a strongly asymmetric double well potential, interacting with a thermal bath. We find that the escape time from the metastable region has a nonmonotonic behavior versus the system-bath coupling and the temperature, producing a stabilizing effect.Keywords: metastability; nonequilibrium statistical mechanics and nonlinear relaxation time; noise enhanced stability; Josephson junction; spin polarized transport in semiconductors; open quantum systems; quantum noise enhanced stability

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Section: Spin Polarised Transportmentioning

confidence: 99%

Section: Short and Long Jjmentioning

confidence: 99%

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Nonlinear Relaxation Phenomena in Metastable Condensed Matter Systems

Spagnolo

Guarcello

Magazzù

et al. 2016

Entropy

100

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“…In some of the proposed models the authors also study the combined effect of different noise sources. In paper [13] the role of noise in three different nonlinear relaxation processes is discussed. In particular, the authors give a brief review of noise-induced phenomena in far-fromequilibrium systems, with particular attention to condensed matter complex systems.…”

Section: Stochastic Modeling and Noise In Complexitymentioning

confidence: 99%

“…In papers [13,14,15,16,17] the modeling approach to complexity is based on the theory of stochastic processes. All these papers, with the exception of the last one, are based on the standard or generalized Langevin equation.…”

Section: Stochastic Modeling and Noise In Complexitymentioning

confidence: 99%

The emergence of self-organization in complex systems–Preface

Paradisi

Kaniadakis

Scarfone

2015

Chaos, Solitons & Fractals

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Analysis of ecological shifts in the two‐age structured population model with Allee effect and environmental noise

Bashkirtseva

Valenti

Spagnolo

2020

Math Methods in App Sciences

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We study noise-induced transformations in the two-age structured population model with the Allee effect and environmental fluctuations. In this bistable model, ecological shifts are associated mathematically with random transitions between basins of coexisting attractors. The following phenomena are revealed and studied: (i) noise-induced extinction, (ii) stochastic regeneration, and (iii) excitement of random mixed-mode oscillations. Constructive abilities of the analytical method of confidence domains are demonstrated in the parametric study of these phenomena.

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Noise-induced effects in nonlinear relaxation of condensed matter systems

Cited by 119 publications

References 123 publications

Nonlinear Relaxation Phenomena in Metastable Condensed Matter Systems

Nonlinear Relaxation Phenomena in Metastable Condensed Matter Systems

The emergence of self-organization in complex systems–Preface

Analysis of ecological shifts in the two‐age structured population model with Allee effect and environmental noise

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