Resolving different pairing states in Weyl superconductors through the single-particle spectrum

TL;DR

This paper theoretically analyzes the single-particle spectra of Weyl superconductors to distinguish between BCS, p+ip, and FFLO pairing states using spectral functions and impurity effects.

Contribution

It provides a method to resolve different pairing states in Weyl superconductors through spectral analysis and impurity effects.

Findings

Different pairing states can be distinguished via bulk and surface spectral functions.

Impurity effects help differentiate BCS-type states from FFLO states.

Spectral signatures uniquely identify each pairing symmetry.

Abstract

We study theoretically single-particle spectra of Weyl superconductors. Three different superconducting pairing states are addressed, which are the BCS-type states with the $s$-wave pairing symmetry and the $p+ip$-wave pairing symmetry, and the FFLO pairing state. We elaborate that these three states can be resolved well based on the bulk and surface spectral functions as well as the local density of states. The single impurity effect is also explored, which may help us to differentiate the BCS-type pairing states and the FFLO state further.