Observation of transition from escape dynamics to underdamped phase diffusion in a Josephson junction

Details Observation of transition from escape dynamics to underdamped phase diffusion in a Josephson junction Observation of transition from escape dynamics to underdamped phase diffusion in a Josephson junction

2005-01-17

arxiv.org/abs/cond-mat/0501383v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.247002

We have investigated the dynamics of underdamped Josephson junctions. In addition to the usual crossover between macroscopic quantum tunnelling and thermally activated (TA) behaviour we observe in our samples with relatively small Josephson coupling E_J, for the first time, the transition from TA behaviour to underdamped phase diffusion. Above the crossover temperature the threshold for switching into the finite voltage state becomes extremely sharp. We propose a (T,E_J) phase-diagram with various regimes and show that for a proper description of it dissipation and level quantization in a metastable well are crucial.

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