Effects of energy-level quantization on the supercurrent decay of Josephson junctions

Citation
B. Ruggiero et al., Effects of energy-level quantization on the supercurrent decay of Josephson junctions, PHYS REV B, 59(1), 1999, pp. 177-180
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
0163-1829 → ACNP
Volume
59
Issue
1
Year of publication
1999
Pages
177 - 180
Database
ISI
SICI code
0163-1829(19990101)59:1<177:EOEQOT>2.0.ZU;2-F
Abstract
We present measurements of the supercurrent decay in high quality Nb/AlOx/N b Josephson junctions which show evidence of energy-level quantization with in the washboard potential describing the junction. The effect of discrete energy levels leads to oscillations in the rate of escape from the zero vol tage state as a function of the bias current, observed at different tempera tures. The oscillation spacing fits that expected from the energy level qua ntization. Moreover, a fit with the quantum theory allows us to derive inte resting conclusions about the effective dissipation of the system at low te mperatures. [S0163-1829(99)08701-9].