Optical conductivity signatures of open Dirac nodal lines
Optical conductivity signatures of open Dirac nodal lines
We investigate the optical conductivity and far-infrared magneto-optical response of ${\mathrm{BaNiS}}_{2}$, a simple square-lattice semimetal characterized by Dirac nodal lines that disperse exclusively along the out-of-plane direction. With the magnetic field aligned along the nodal line the in-plane Landau level spectra show a nearly $\sqrt{B}$ behavior, the hallmark of a …