Optical signatures of Dirac nodal lines in NbAs 2

Yinming Shao, Zhiyuan Sun, Ying Wang, Chenchao Xu, Raman Sankar, Alexander J. Breindel, Chao Cao, Michael M. Fogler, Andrew J. Millis, Fangcheng Chou, Zhiqiang Li, Thomas Timusk, M. Brian Maple, D. N. Basov

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

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 NbAs 2 where the spin-orbit coupling (SOC) triggers energy gaps along the nodal lines. These gaps manifest as sharp steps in the optical conductivity spectra σ 1 (ω). This behavior is followed by the linear power-law scaling of σ 1 (ω) at higher frequencies, consistent with our theoretical analysis for dispersive Dirac nodal lines.

Original languageEnglish (US)
Pages (from-to)1168-1173
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number4
DOIs
StatePublished - Jan 22 2019

All Science Journal Classification (ASJC) codes

  • General

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