The conductance of superconducting-normal hybrid structures

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 (for this geometry the solutions of the BDG equation conserve charge). We show that the presence of a superconductor segment within an otherwise normal metal may {\em reduce} the overall conductance of the composite structure. This reduction enhances the tendency of the NS composite to become insulating.

11 pages 4 figures

References in corpus (3)

• Experimental evidence for a collective insulating state in two-dimensional superconductors
• Positive noise cross-correlations in superconducting hybrids: Roles of interfaces and interactions
• Isolated hybrid normal/superconducting ring in a magnetic flux: from persistent current to Josephson current

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