Josephson current carried by Andreev levels in superconducting quantum point contacts

Details Josephson current carried by Andreev levels in superconducting quantum point contacts Josephson current carried by Andreev levels in superconducting quantum point contacts

1998-11-03

arxiv.org/abs/cond-mat/9811026v2

Superlattices and Microstructures 25 (1999) 809

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures, submitted to Superlattices and Microstructures

Scientific paper

10.1006/spmi.1999.0730

The dc Josephson effect in a superconducting quantum point contact, where supercurrent flows through a small number of channels, is reviewd. The central role of Andreev levels is emphasized which carry the whole supercurrent in short symmetric Josephson junctions including tunnel junctions. A simple intuitive view of the dc Josephson effect in a quantum point contact is given in terms of multiple Andreev reflections. The quantization of the critical current in superconducting quantum point contacts is briefly discussed.

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