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artículos
Título:
EFFECT OF THERMAL NOISE ON THE CURRENT-VOLTAGE CHARACTERISTICS OF JOSEPHSON JUNCTIONS
Autor/es:
A K CHATTAH, C B BRIOZZO, OMAR OSENDA, M O CACERES
Revista:
MODERN PHYSICS LETTERS B
Referencias:
Año: 1996 vol. 10 p. 1095 - 1102
ISSN:
0217-9849
Resumen:
We analyze the influence of thermal noise on the Shapiro steps appearing in the current-voltage characteristics of Josephson junctions. We solve the Fokker-Planck equation describing the system by a path integral method in the steepest-descent approximation, previously applied to the stochastic resonance problem. We obtain the Asymptotic Time-Periodic Distribution Pas(ϕ, t), where ϕ∈[0, 2π] and compute from it the voltage , constructing the I-V characteristics. We find a defined “softening” of the Shapiro steps as temperature increases, for values of the system parameters in the experimentally accessible range.