# Roles of anisotropic and unequal gaps in the quasiparticle interference of superconducting iron pnictides

## TL;DR

This paper explores how anisotropic and unequal superconducting gaps influence quasiparticle interference patterns in iron pnictides, providing insights into gap sign changes and robustness of interference features.

## Contribution

It introduces a detailed analysis of the effects of gap anisotropy and inequality on quasiparticle interference in iron pnictides using a five-orbital model.

## Key findings

- Differences in gap sensitivities affect quasiparticle interference signatures.
- Anisotropy and gap inequality influence the robustness of sign change detection.
- Results help interpret experimental quasiparticle interference data.

## Abstract

We investigate the role of gap characteristics such as anisotropy and inequality of the gaps in the quasiparticle interferences of iron pnictides using a five-orbital tight-binding model. We examine how the difference in the sensitivities exhibited by the sign-changing and -preserving $s$-wave superconductivity in an annular region around ($\pi, 0$), which can be used to determine the sign change of the superconducting gap, gets affected when the gaps are unequal on the electron and hole pocket. In addition, we also discuss how robust these differentiating features are on changing the quasiparticle energy or when the gap is anisotropic.