Tunneling spectra for quasi-one-dimensional organic superconductors

TL;DR

This paper calculates tunneling conductance spectra for quasi-one-dimensional organic superconductors with different pairing symmetries, revealing zero energy peaks and spectral sensitivities related to the pair potential's sign and nodes.

Contribution

It provides a theoretical analysis of tunneling spectra for various pairing symmetries in quasi-one-dimensional superconductors using the BTK formulation.

Findings

Zero energy peaks appear in tunneling spectra for certain directions.

Spectral line shapes depend on the nodes of the pair potential.

Sign changes in the pair potential influence tunneling features.

Abstract

The tunneling conductance spectra of a normal-metal/insulator/quasi-one-dimensional superconductor is calculated by using the Blonder-Tinkham-Klapwijk formulation. The pairing symmetry of the superconductor is assumed to be $p$, $d$, and $f$-wave. It is found that there is a well defined zero energy peak in electron tunneling along the direction parallel to the chains or normal to these when the transmitted quasiparticles feel different sign of the pair potential. The actual line shape of the spectra is sensitive to the nodes of the pair potential on the Fermi surface.