Dynamical conductivity in topological nodal-line semimetal ZrSiS

TL;DR

This paper investigates the dynamical conductivity of ZrSiS, a candidate topological nodal-line semimetal, revealing frequency dependence deviations from ideal models and effects of disorder, with implications for similar compounds.

Contribution

It introduces a multi-orbital theoretical model based on first-principles calculations to analyze dynamical conductivity in ZrSiS, highlighting the impact of disorder and extending to related materials.

Findings

Dynamical conductivity is not frequency independent in ZrSiS.

Energy broadening due to disorder flattens the conductivity dependence.

Results are applicable to similar compounds like ZrSiSe, ZrSiTe, and HfSiS.

Abstract

ZrSiS is one of the strong candidates for realistic nodal-line semimetal. We theoretically investigate the dynamical conductivity in ZrSiS by using a multi-orbital theoretical model based on the first-principles band calculation. We find that the dynamical conductivity in the clean limit is actually not frequency independent unlike the ideal Dirac model, while nearly flat dependence is achieved by introducing the energy broadening possibly induced by the disorder. The results can be applied to other compounds with the similar crystal structure, such as ZrSiSe, ZrSiTe, and HfSiS.