Physics – Condensed Matter – Superconductivity
Scientific paper
2011-11-22
Phys. Rev. B 84, 184504 (2011)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.84.184504
We report on the occurrence of multiple hopping and retrapping of a Brownian particle in a tilted washboard potential. The escape dynamic has been studied experimentally by measuring the switching current distributions as a function of temperature in a moderately damped NbN/MgO/NbN Josephson junction. At low temperatures the second moment of the distribution increases in agreement with calculations based on Kramers thermal activation regime. After a turn-over temperature T*, the shape of the distributions starts changing and width decreases with temperature. We analyze the data through fit of the switching probability and Monte Carlo simulations and we find a good agreement with a model based on a multiple retrapping process.
Barone Antonio
Kawakami Akira
Longobardi Luigi
Massarotti Davide
Papari Gianpaolo
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