Temperature and excitation energy dependence of Raman scattering in nodal line Dirac semimetal ZrAs₂

2024/04/26 by R. Bacewicz, Bacewicz, R., Cezariusz Jastrzębski +9
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Inorganic Chemistry and Materials #Materials Science (cond-mat.mtrl-sci) #Topological Materials and Phenomena

paper · pdf · doi:10.48550/arxiv.2404.17665

openalex publication_date 2024/04/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present a Raman study of ZrAs₂ single crystals, a nodal line semimetal with symmetry-enforced Dirac-like band crossings. We identified the symmetry of phonon modes by polarized light measurements and comparison with calculated phonon frequencies. Significant dependence of peak intensities on the excitation wavelength was observed, indicating quantum interference effects. Phonon peaks in the spectra are superimposed on the electronic background, with quasi-elastic scattering observed for the 785 nm excitation. We identified the Fano shape of the 171 cm^-1 Ag mode due to interference of the phonon state with the electronic continuum. The temperature dependence of phonon peaks linewidth indicates that the electron-phonon coupling plays an essential role in phonon decay.

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