Tunneling conductance of ferromagnet/noncentrosymmetric superconductor junctions

TL;DR

This study analyzes how Rashba spin-orbit coupling, exchange energy, and Fermi wave-vector mismatch influence tunneling conductance in ferromagnet/noncentrosymmetric superconductor junctions using an extended BTK formalism.

Contribution

It provides a detailed theoretical analysis of conductance behavior considering multiple effects, including RSOC and FWM, in ferromagnet/noncentrosymmetric superconductor junctions.

Findings

Conductance suppressed by RSOC away from the gap edge.

Near the gap edge, conductance is almost independent of RSOC.

FWM enhances conductance as the FWM parameter decreases.

Abstract

Based on the extended Blonder-Tinkham-Klapwijk formalism, the tunneling conductance characteristics of a planar junction between a ferromagnet and a noncentrosymmetric superconductor are studied. The effects of the Rashba spin-orbit coupling (RSOC), the exchange energy, and the Fermi wave-vector mismatch (FWM) on the conductance are all taken into account. In the absence of the FWM, it is found that far away from the gap edge the conductance is suppressed by the RSOC, while around the gap edge it is almost independent of RSOC. The interplay of the RSOC and the exchange energy causes an enhancement of the subgap conductance, which is more pronounced when the RSOC is small. When the FWM is introduced, it is shown that the conductance is monotonically enhanced as the FWM parameter decreases.