Conductance of superconducting-normal hybrid structures

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Abstract

The dc conductance of normal-superconducting hybrid structures is discussed. It is shown that since the Bogoliubov-DeGennes (BDG) equation does not conserve charge, its application to create a Landauer-type approach for the conductance of the NSN system is problematic. We "mend" this deficiency by calculating the conductance from the Kubo formula for a ring configuration, where charge conservation is imposed by the annular geometry. We show that the presence of a superconductor segment within an otherwise normal metal may reduce the overall conductance of the composite structure. This reduction enhances the tendency of the NS composite to become insulating.

Original languageEnglish
Article number224510
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number22
DOIs
StatePublished - 1 Dec 2008

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