Observation of Transition from Escape Dynamics to Underdamped Phase Diffusion in a Josephson Junction
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Journal Title
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School of Science |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2005
Major/Subject
Mcode
Degree programme
Language
en
Pages
247002/1-4
Series
Physical Review Letters, Volume 94, Issue 24
Abstract
We have investigated the dynamics of underdamped Josephson junctions with a relatively small Josephson coupling EJ. In addition to the usual crossover between macroscopic quantum tunneling and thermally activated (TA) behavior we observe, for the first time, the transition from TA behavior to underdamped phase diffusion. Above the crossover temperature, the threshold for switching into the finite-voltage state becomes extremely sharp. We propose a (T, EJ) phase diagram with various regimes and show that for a proper description of it, dissipation and level quantization in a metastable well are crucial.Description
Keywords
Josephson junctions, macroscopic quantum tunneling, thermally activated behavior
Other note
Citation
Kivioja, J. M. & Nieminen, T. E. & Claudon, J. & Buisson, O. & Hekking, F. W. J. & Pekola, Jukka. 2005. Observation of Transition from Escape Dynamics to Underdamped Phase Diffusion in a Josephson Junction. Physical Review Letters. Volume 94, Issue 24. P. 247002/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.94.247002.
