Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-11-13
Superlatt. Microstruct. 25, 915-923 (1999)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 6 figures, submitted to Superlattices and Microstructures
Scientific paper
10.1006/spmi.1999.0739
In the classical Josephson effect the phase difference across the junction is well defined, and the supercurrent is reduced only weakly by phase diffusion. For mesoscopic junctions with small capacitance the phase undergoes large quantum fluctuations, and the current is also decreased by Coulomb blockade effects. We discuss the behavior of the current-voltage characteristics in a large range of parameters comprising the phase diffusion regime with coherent Josephson current as well as the supercurrent peak due to incoherent Cooper pair tunneling in the Coulomb blockade regime.
Grabert Hermann
Ingold Gert-Ludwig
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