Surface-angle dependence of the tunneling spectroscopy in iron-based superconductors: sign-reversing s-wave scenarios

TL;DR

This paper investigates how surface orientation affects tunneling spectroscopy in iron-based superconductors, revealing that normal state properties influence Andreev bound states and their spectral features.

Contribution

It introduces a quasiclassical approach to analyze surface-angle dependence in Fe-based superconductors considering isotropic and anisotropic s-wave gaps.

Findings

Andreev bound state peak positions are independent of gap anisotropy.

Normal state properties significantly influence surface Andreev bound states.

Surface-angle dependence provides insights into the pairing symmetry.

Abstract

We discuss the surface Andreev bound states in Fe-based superconductors with the use of an effective five-band model and investigate the surface-angle dependence of the tunneling spectroscopy by a quasiclassical approach for an isotropic and an anisotropic /pm s-wave gap superconductivity. We show that information on the normal state is important for the Andreev bound state and its peak positions do not depend on the gap amplitude anisotropy.