Journal
PHYSICAL REVIEW B
Volume 78, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.224510
Keywords
chemical potential; mesoscopic systems; metal-insulator transition; superconducting energy gap; superconductor-normal-superconductor devices
Funding
- German Federal Ministry of Education and Research (BMBF) within the framework of the German- Israeli project cooperation (DIP)
- Israel Science Foundation (ISF)
- Converging Technologies Program of the Israel Science Foundation (ISF) [1783/07]
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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.
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