Microwave-induced thermal escape in Josephson junctions

Details Microwave-induced thermal escape in Josephson junctions Microwave-induced thermal escape in Josephson junctions

2004-03-09

arxiv.org/abs/cond-mat/0403245v1

Physical Review Letters Vol.93, 107002 (2004)

Physics

Condensed Matter

Superconductivity

10 pages and 4 figures

Scientific paper

10.1103/PhysRevLett.93.107002

We investigate, by experiments and numerical simulations, thermal activation processes of Josephson tunnel junctions in the presence of microwave radiation. When the applied signal resonates with the Josephson plasma frequency oscillations, the switching current may become multi-valued in a temperature range far exceeding the classical to quantum crossover temperature. Plots of the switching currents traced as a function of the applied signal frequency show very good agreement with the functional forms expected from Josephson plasma frequency dependencies on the bias current. Throughout, numerical simulations of the corresponding thermally driven classical Josephson junction model show very good agreement with the experimental data.

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