Observation of transition from escape dynamics to underdamped phase diffusion in a Josephson junction
Mesoscale and Nanoscale Physics
2009-11-11 v1 Superconductivity
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0501383,
title = {Observation of transition from escape dynamics to underdamped phase diffusion in a Josephson junction},
author = {J. M. Kivioja and T. E. Nieminen and J. Claudon and O. Buisson and F. W. J. Hekking and J. P. Pekola},
journal= {arXiv preprint arXiv:cond-mat/0501383},
year = {2009}
}
Comments
4 pages, 3 figures