Optical conductivity signatures of open Dirac nodal lines

We investigate the optical conductivity and far-infrared magneto-optical response of 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...

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Bibliographic Details
Published in:arXiv.org 2021-11
Main Authors: Santos-Cottin, D, Casula, M, L de' Medici, F Le Mardelé, Wyzula, J, Orlita, M, Klein, Y, Gauzzi, A, Akrap, A, R P S M Lobo
Format: Article
Language:English
Subjects:
Brillouin zones
Cones
Dispersion
First principles
Line spectra
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Summary:We investigate the optical conductivity and far-infrared magneto-optical response of 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 conical-band dispersion with a small spin-orbit coupling gap. The optical conductivity exhibits an unusual temperature-independent isosbestic line, ending at a Van Hove singularity. First-principles calculations unambiguously assign the isosbestic line to transitions across Dirac nodal states. Our work suggests a universal topology of the electronic structure of Dirac nodal lines.
ISSN:2331-8422
DOI:10.48550/arxiv.2104.05521