Josephson current through a superconducting quantum point contact shorter than the coherence length
Year: 1991
Type: article
Abstract: It is shown theoretically that the critical current of a smooth and impurity-free superconducting constriction increases stepwise as a function of its width. The step height at zero temperature is e${\mathrm{\ensuremath{\Delta}}}_{0}$/\ensuremath{\Elzxh}, dependent on the energy gap ${\mathrm{\ensuremath{\Delta}}}_{0}$ of the bulk superconductor but not on the junction parameters. This is the analog of the quantized conductance of a point contact in the normal state. It is essential that the constriction is short compared to the superconducting coherence length.
Source: Physical Review Letters
Authors: C. W. J. Beenakker, H. van Houten
Institutions: Philips (Netherlands), Signify (Netherlands)
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1982608371