Conductance Anomalies for Normal-Metal-Insulator-Superconductor Contacts

TL;DR

This paper investigates how conductance anomalies in normal-metal-insulator-superconductor contacts depend on barrier resistance, revealing different behaviors at zero and finite voltages based on the barrier's properties.

Contribution

It demonstrates the dependence of conductance anomalies on barrier resistance, providing new insights into the behavior of N-I-S junctions with varying resistances.

Findings

Enhanced conductance near zero voltage at high barrier resistance

Anomaly appears at finite voltage for low barrier resistance

Conductance behavior varies significantly with barrier resistance

Abstract

This paper considers the conductance through a dirty junction between a normal conductor and a superconductor with an insulating barrier. It is shown that for large barrier resistances there is a relative enhancement of the conductance near zero voltage, whereas for low barrier resistance this anomaly appears at finite voltage.