Search results for "ZERO-VOLTAGE STATE"

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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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Phase dynamics in graphene-based Josephson junctions in the presence of thermal and correlated fluctuations

2014

In this work we study by numerical methods the phase dynamics in ballistic graphene-based short Josephson junctions. The supercurrent through a graphene junction shows a non-sinusoidal phase-dependence, unlike a conventional junction ruled by the well-known d.c. Josephson relation. A superconductor-graphene-superconductor system exhibits superconductive quantum metastable states similar to those present in normal current-biased JJs. We explore the effects of thermal and correlated fluctuations on the escape time from these metastable states, when the system is stimulated by an oscillating bias current. As a first step, the analysis is carried out in the presence of an external Gaussian whit…

Josephson effectTIMING ERRORSNON-GAUSSIAN NOISEFOS: Physical sciencesBROWNIAN-MOTIONSwitching timeSuperconductivity (cond-mat.supr-con)MetastabilityCondensed Matter::SuperconductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)NOISE ENHANCED STABILITY; ZERO-VOLTAGE STATE; NON-GAUSSIAN NOISE; RESONANT ACTIVATION; ESCAPE-TIME; METASTABLE STATE; BISTABLE SYSTEM; BROWNIAN-MOTION; TIMING ERRORS; FABRY-PEROTMETASTABLE STATEBISTABLE SYSTEMFABRY-PEROTBrownian motionsupercurrentPhysicsESCAPE-TIMERESONANT ACTIVATIONCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsCondensed Matter - SuperconductivitydiffusionSupercurrentBiasingCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsNOISE ENHANCED STABILITYZERO-VOLTAGE STATEColors of noiseNoise (radio)
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