Effects due to unconventional pairing in transport through a normal metalsuperconductor-normal metal hybrid junction

TL;DR

This paper investigates how mixed singlet and chiral triplet pairings in a normal metal-superconductor-normal metal junction influence transport, revealing resonance phenomena and zero energy conductance peaks in the topological phase.

Contribution

It demonstrates the emergence of resonance and zero energy peaks in conductance due to dominant chiral triplet pairing in NSN junctions, highlighting effects of unconventional pairing.

Findings

Resonance occurs with quantum scattering probabilities at 0.25.

Zero energy conductance peaks appear in the topological phase.

Crossed Andreev reflection shows a zero energy peak at resonance.

Abstract

We explore transport properties of a normal metal-superconductor-normal metal (NSN) junction, where the superconducting region supports mixed singlet and chiral triplet pairings. We show that in the subgapped regime when the chiral triplet pairing amplitude dominates over that of the singlet, a resonance phenomena emerges out where all the quantum mechanical scattering probabilities acquire a value of 0.25. At the resonance, crossed Andreev reflection mediating through such junction, acquires a zero energy peak. This reflects as a zero energy peak in the conductance as well in the topological phase when $\Delta_p > \Delta_s$.