Screening of the Raman response in multiband superconductors -- application to iron-pnictides

TL;DR

This paper models the Raman response in multiband superconductors, specifically iron-pnictides, revealing how screening effects influence the A_{1g} symmetry channel and aligning theoretical predictions with experimental data.

Contribution

It provides the first detailed analytical and numerical analysis of screening effects in the Raman response of multiband superconductors, tailored to iron-pnictide materials.

Findings

Screening effects significantly impact the Raman response in the A_{1g} channel.

Model calculations can be adjusted to match experimental Raman spectra.

Analytical and numerical methods complement each other in understanding multiband effects.

Abstract

We performed model calculations of Raman responses for multiband 2D superconductors. The multiband effects of screening in the A_{1g} symmetry channel were investigated analytically and numerically for a band structure model mimicing ARPES data on iron-pnictide materials. An acceptable agreement between our model calculations and recent experimental data is demonstrated by modification of the band structure parameters.