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Optical signatures of Dirac nodal lines in NbAs
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Journal Article
Optical signatures of Dirac nodal lines in NbAs
2019
Overview
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 NbAs₂ where the spin-orbit coupling (SOC) triggers energy gaps along the nodal lines. These gaps manifest as sharp steps in the optical conductivity spectra σ₁(ω). This behavior is followed by the linear power-law scaling of σ₁(ω) 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 NbAs₂.
Publisher
National Academy of Sciences
Subject
