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Proximity-induced transport in superconductor - normal metal nanostructures

Research output: Contribution to journalLetter

Published

Journal publication date1998
JournalJournal of Physics: Condensed Matter
Journal number35
Volume10
Number of pages7
PagesL615-L621
Original languageEnglish

Abstract

We calculate the conductance for a diffusive normal wire (N) in contact with a superconductor (S). Using a numerical scattering matrix approach and a quasiclassical Green function technique, we compare the conductance G of the system connected to two normal reservoirs when the superconductor is in its normal state with the conductance G(s) in the superconducting state and predict that the difference delta G = G(s) - G may be negative or positive depending upon the S/N interface resistance and the interface resistance at the ends of the N wire. As the temperature T is varied, delta G(T) may change sign and exhibit two maxima.