Dynamical conductivity in topological nodal-line semimetal ZrSiS

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.

6 pages, 7 figures

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• Many-body effects in nodal-line semimetals: correction to the optical conductivity
• Optical conductivity of the threefold Hopf semimetal
• Polarization-dependent excitons and plasmon activity in nodal-line semimetal ZrSiS
• Optical conductivity of the topologically-nontrivial MXenes, Mo${}_2$HfC${}_2$O${}_2$ and W${}_2$HfC${}_2$O${}_2$: first-principles calculation and effective model analysis