Flat optical conductivity in ZrSiS due to two-dimensional Dirac bands

M. B. Schilling, L. M. Schoop, B. V. Lotsch +2

ZrSiS exhibits a frequency-independent interband conductivity $\sigma (\omega )=\mathrm{const}(\omega )\equiv {\sigma }_{\mathrm{flat}}$ in a broad range from 250 to 2500 cm${}^{-1}$ (30 - 300 meV). This makes ZrS…