期刊
PHYSICAL REVIEW B
卷 84, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.184504
关键词
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资金
- STREP MIDAS-Macroscopic Interference Devices for atomic and Solid State Physics: Quantum Control of Supercurrents
- Marie Curie International Reintegration Grant [248933]
- MIUR
- ISCRA the Italian SuperComputing Resource Allocation [IscrB_NDJJBS]
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 turnover 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.
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