Search results for "Nonequilibrium statistical mechanics"

showing 4 items of 4 documents

Nonlinear relaxation phenomena in metastable condensed matter systems

2016

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 s…

Josephson effectQuantum noise enhanced stabilityGeneral Physics and AstronomyThermal fluctuationslcsh:AstrophysicsDouble-well potential01 natural sciences7. Clean energySettore FIS/03 - Fisica Della Materia010305 fluids & plasmasOpen quantum systemsMetastabilityMetastabilityJosephson junctionlcsh:QB460-4660103 physical sciencesSpin polarized transport in semiconductorsddc:530lcsh:Science010306 general physicsSpin (physics)Quantum fluctuationNoise enhanced stabilityPhysicsmetastability; nonequilibrium statistical mechanics and nonlinear relaxation time; noise enhanced stability; Josephson junction; spin polarized transport in semiconductors; open quantum systems; quantum noise enhanced stabilityCondensed matter physicsNonequilibrium statistical mechanics and nonlinear relaxation timeJosephson junction; Metastability; Noise enhanced stability; Nonequilibrium statistical mechanics and nonlinear relaxation time; Open quantum systems; Quantum noise enhanced stability; Spin polarized transport in semiconductorsDissipationlcsh:QC1-999Open quantum systemlcsh:Qlcsh:PhysicsNoise (radio)
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Stabilization Effects of Dichotomous Noise on the Lifetime of theSuperconducting State in a Long Josephson Junction

2015

We investigate the superconducting lifetime of a long overdamped current-biased Josephson junction, in the presence of telegraph noise sources. The analysis is performed by randomly choosing the initial condition for the noise source. However, in order to investigate how the initial value of the dichotomous noise affects the phase dynamics, we extend our analysis using two different fixed initial values for the source of random fluctuations. In our study, the phase dynamics of the Josephson junction is analyzed 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…

Josephson effectSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciGeneral Physics and Astronomylong Josephson junctionlcsh:AstrophysicsmetastabilityPhysics and Astronomy (all)Mean switching timenonlinear relaxation timeCondensed Matter::SuperconductivityMetastabilitylcsh:QB460-466Initial value problemlcsh:ScienceSuperconductivityPhysicsCondensed matter physicsNoise (signal processing)Nonequilibrium statistical mechanicsQuantum noiseShot noiselcsh:QC1-999noise enhanced stabilitymean switchingtimenonequilibrium statisticalmechanicsNonequilibrium statistical mechaniclcsh:QDichotomous noise; Long Josephson junction; Mean switching time; Metastability; Noise enhanced stability; Nonequilibrium statistical mechanics; Nonlinear relaxation timelcsh:PhysicsLong Josephson junctiondichotomous noiseEntropy
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Nonequilibrium statistical mechanics of dilute relativistic plasmas

2005

PhysicsNonequilibrium statistical mechanicsQuantum electrodynamicsPlasma
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New trends in nonequilibrium statistical mechanics: classical and quantum systems

2020

The main aim of this special issue is to report recent advances and new trends in nonequilibrium statistical mechanics of classical and quantum systems, from both theoretical and experimental points of view, within an interdisciplinary context. In particular, the nonlinear relaxation processes in the dynamics of out-of-equilibrium systems and the role of the metastability and environmental noise will be overviewed. Three main areas of nonequilibrium statistical mechanics will be covered: slow relaxation phenomena and dissipative dynamics; long-range interactions and classical systems; quantum systems. New trends such as quantum thermodynamics and novel types of quantum phase transitions occ…

Statistics and ProbabilityPhysicsQuantum phase transitionNonequilibrium statistical mechanicsClassical mechanicsSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciStatistical and Nonlinear PhysicsMetastable states Quantum phase transitions Topological phases of matterStatistics Probability and UncertaintyQuantum
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