Optical Signatures of Dirac Nodal-lines in NbAs\(_2\)

Using polarized optical and magneto-optical spectroscopy, we have demonstrated universal aspects of electrodynamics associated with Dirac nodal-lines. We investigated anisotropic electrodynamics of NbAs\(_2\) where the spin-orbit interaction triggers energy gaps along the nodal-lines, which manifest...

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Bibliographic Details
Published in:arXiv.org 2018-06
Main Authors: Shao, Yinming, Sun, Zhiyuan, Wang, Ying, Xu, Chenchao, Sankar, R, Breindel, Alex J, Cao, Chao, Fogler, M M, Chou, Fangcheng, Li, Zhiqiang, Timusk, T, Maple, M Brian, Basov, D N
Format: Article
Language:English
Subjects:
Electrodynamics
Energy gap
Spectrum analysis
Spin-orbit interactions
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Summary:Using polarized optical and magneto-optical spectroscopy, we have demonstrated universal aspects of electrodynamics associated with Dirac nodal-lines. We investigated anisotropic electrodynamics of NbAs\(_2\) where the spin-orbit interaction triggers energy gaps along the nodal-lines, which manifest as sharp steps in the optical conductivity spectra. We show experimentally and theoretically that shifted 2D Dirac nodal-lines feature linear scaling \(\sigma_1 (\omega)\sim\omega\), similar to 3D nodal-points. Massive Dirac nature of the nodal-lines are confirmed by magneto-optical data, which may also be indicative of theoretically predicted surface states. Optical data also offer a natural explanation for the giant magneto-resistance in NbAs\(_2\).
ISSN:2331-8422
DOI:10.48550/arxiv.1806.01996