Comment on "Ballistic SNS sandwich as a Josephson junction"

Abstract

The old problem of supercurrent in a long ballistic SNS Josephson junction is interpreted using a simple picture of the fermion energy levels in the normal and superconducting regions. We argue that a recent paper on the topic by Sonin contains erroneous results.

5 pages, 1 figure, version accepted for publication in Physical Review B, includes some clarifications in the main text and an appendix containing mathematical details