Comment on "Square-well model for superconducting pair-potential"
arXiv:2410.12580
Abstract
The current-phase relation for a ballistic SNS junction in a 1D wire at T = 0 was derived by Thuneberg [1] neglecting phase gradients in superconducting leads. This invalidates the derivation, since the charge conservation law is violated. The theory of Ref. [1] predicts an unphysical phase jump in the limit of zero normal-layer thickness. In this limit the SNS junction becomes an ideal uniform superconductor, in which the currentis supported by a constant phase gradient without any phase jump.
Comment on arXiv:2405.07659, 6 pages, 1 figure, submitted to Journal of Low Temperature Physics, some references updated