Realistic Surface Scattering and Surface Bound State Formation in the High T_c Superconductor YBa_2Cu_3O_{6+x}

TL;DR

This paper investigates how surface scattering and roughness influence the formation of surface bound states in YBa_2Cu_3O_{6+x}, explaining experimental features like the zero bias conductance peak.

Contribution

It demonstrates the crucial roles of surface Umklapp scattering and roughness in realistic models, providing explanations for experimental observations of surface states.

Findings

Surface scattering affects the shape of surface bound states.

Surface roughness influences the impurity dependence of conductance.

Results support a universal width of the zero bias conductance peak.

Abstract

Surface Umklapp scattering of quasiparticles, and surface roughness are shown to play essential roles in the formation of the surface bound states in realistic models for YBa_2Cu_3O_{6+x}. The results account for the shape, the impurity dependence of the height, and for a proposed universal width of the zero bias conductance peak.