Low Temperature Physics: 38, 263 (2012); https://doi.org/10.1063/1.3699625 (10 pages)
Физика Низких Температур: Том 38, Выпуск 4 (Апрель 2012), c. 336-347    ( к оглавлению , назад )

Escape dynamics in moderately damped Josephson junctions (Review Article)

D. Massarotti1,2, L. Longobardi3, L. Galletti1,2, D. Stornaiuolo1,2, D. Montemurro4, G. Pepe1,2, G. Rotoli5, A. Barone1,2, and F. Tafuri5,2,1

1Dip. Scienze Fisiche, Universitá di Napoli Federico II, Piazzale Tecchio 80, Napoli 80125, Italy

2CNR-SPIN, UOS Napoli, Monte S. Angelo via Cinthia, Napoli 80126, Italy

3Department of Physics and Astronomy, Dartmouth College, Hanover NH 03755, USA

4NEST and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy

5Dip. Ingegneria dell'Informazione, Seconda Universitá di Napoli, via Roma 29, Aversa (CE) 81031, Italy
E-mail: tafuri@na.infn.it

Received February 15, 2012

Аннотация

The Josephson effect is a privileged access to the macroscopic quantum nature of superconductors. We review some ideas and experimental techniques on macroscopic quantum decay phenomena occurring in Josephson structures. The attention is mainly addressed to intermediate levels of dissipation which characterize a large majority of low critical current Josephson devices and are therefore an avoidable consequence of nanotechnology applied more and more to Josephson devices. Phase diffusion phenomena take over thermal activation in some temperature ranges also affecting the transition to macroscopic quantum tunneling, enriching the phase diagram mostly defined by the Josephson energy, the temperature and the level of dissipation.

PACS: 74.72.–h Cuprate superconductors;
PACS: 74.50.+r Tunneling phenomena; Josephson effects;
PACS: 74.40.–n Fluctuation phenomena.

Ключевые слова: Josephson effect, SQUIDs, macroscopic quantum tunneling.