Anomalous charge transport in mesoscopic triplet superconductor junctions

TL;DR

This paper investigates the unique charge transport phenomena in diffusive normal metal/triplet superconductor junctions, revealing enhanced proximity effects, zero-bias conductance peaks, and resistance behaviors distinct from singlet superconductor junctions.

Contribution

It demonstrates the anomalous proximity effect and transport properties specific to triplet superconductor junctions using the Keldysh-Nambu Green's function formalism.

Findings

Enhanced proximity effect due to mid gap Andreev resonant states

Drastic reduction and independence of total resistance in extreme cases

Presence of giant zero-bias conductance peaks and zero-energy local density of states

Abstract

Charge transport properties of a diffusive normal metal /triplet superconductor (DN/TS) junction are studied based on the Keldysh-Nambu quasiclassical Green's function formalism. % Contrary to the unconventional singlet superconductor junction case, the mid gap Andreev resonant state (MARS) at the interface of the TS is shown to enhance the proximity effect in the DN. % The total resistance of the DN/TS junction is drastically reduced and is completely independent of the resistance of the DN in the extreme case. % Such anomalous transport accompanies a giant zero-bias peak in the conductance spectra and a zero-energy peak of the local density of states in the DN region. % These striking features manifest the presence of novel proximity effect peculiar to triplet superconductor junctions.