0000000000273110

AUTHOR

C Guarcello

showing 2 related works from this author

Magnetically excited breather modes in an overlap-geometry Josephson tunnel junction

2022

A scheme for the controlled generation of single traveling sine- Gordon breathers in a long Josephson junction is described. In the presence of dissipation, a direct current source, and thermal fluctuations, the theoretical analysis shows that, through the nonlinear supratransmission effect, tailored magnetic pulses at the junction’s edge can effectively yield breather modes only.

Traveling sine-Gordon breatherSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciStochastic fluctuationsLong Josephson junctionNonlinear supratransmission
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Nonlinear relaxation in quantum and mesoscopic systems

2013

The nonlinear relaxation of three mesoscopic and quantum systems are investigated. Specifically we study the nonlinear relaxation in: (i) a long Josephson junction (LJJ) driven by a non-Gaussian Lévy noise current; (ii) a metastable quantum open system driven by an external periodical driving; and (iii) the electron spin relaxation process in n-type GaAs crystals driven by a fluctuating electric field. In the first system the LJJ phase evolution is described by the perturbed sine-Gordon equation. Two well known noise induced effects are found: the noise enhanced stability and resonant activation phenomena. We investigate the mean escape time as a function of the bias current frequency, nois…

Relaxationquantum dissipative systemelectron spin relaxationMetastability; Relaxation; Mesoscopic Systems; Josephson junction; sine-Gordon; soliton; Lévy noise; quantum dissipative system; Caldeira-Leggett; discrete variable representation; electron spin relaxation; Monte Carlo;Settore FIS/03 - Fisica Della MateriaLévy noiseMesoscopic SystemMetastabilitysine-Gordondiscrete variable representationJosephson junctionsolitonMonte CarloCaldeira-Leggett
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