Excess conductance in normal-metal/Anderson insulator/superconductor junctions

A. Vaknin, A. Frydman, Z. Ovadyahu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The current-voltage characteristics of (Formula presented) tunnel junctions exhibit peculiar zero-bias anomalies. At low temperatures the zero-bias resistance attains saturation values that are smaller than the normal-state resistance by a factor that often exceeds 2. This zero-bias anomaly (ZBA) is also characterized by voltage (Formula presented) where Δ is the energy gap of lead. δ depends on the thickness of the (Formula presented) layer. In the presence of a microwave field the ZBA features are affected in a nontrivial way. The possibility that these features arise from the nature of the barrier being an Anderson insulator is discussed.

Original languageAmerican English
Pages (from-to)13037-13044
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
StatePublished - 2000


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