Optical signatures of Dirac nodal lines in NbAs 2
Journal
Proceedings of the National Academy of Sciences of the United States of America
Journal Volume
116
Journal Issue
4
Pages
1168-1173
Date Issued
2019
Author(s)
Shao, Y.
Sun, Z.
Wang, Y.
Xu, C.
Sankar, R.
Breindel, A. J.
Cao, C.
Fogler, M. M.
Millis, A. J.
Li, Z.
Timusk, T.
Brian Maple, M.
Basov, D. N.
Abstract
Using polarized optical and magneto-optical spectroscopy, we have demonstrated universal aspects of electrodynamics associated with Dirac nodal lines that are found in several classes of unconventional intermetallic compounds. We investigated anisotropic electrodynamics of [Formula: see text] where the spin-orbit coupling (SOC) triggers energy gaps along the nodal lines. These gaps manifest as sharp steps in the optical conductivity spectra [Formula: see text] This behavior is followed by the linear power-law scaling of [Formula: see text] at higher frequencies, consistent with our theoretical analysis for dispersive Dirac nodal lines. Magneto-optics data affirm the dominant role of nodal lines in the electrodynamics of [Formula: see text].
Publisher
National Academy of Sciences
Type
journal article