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A Raman probe of phonons and electron–phonon interactions in the Weyl semimetal NbIrTe4
- Source :
- Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021), Scientific Reports
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- There is tremendous interest in measuring the strong electron–phonon interactions seen in topological Weyl semimetals. The semimetal NbIrTe4 has been proposed to be a Type-II Weyl semimetal with 8 pairs of opposite Chirality Weyl nodes which are very close to the Fermi energy. We show using polarized angular-resolved micro-Raman scattering at two excitation energies that we can extract the phonon mode dependence of the Raman tensor elements from the shape of the scattering efficiency versus angle. This van der Waals semimetal with broken inversion symmetry and 24 atoms per unit cell has 69 possible phonon modes of which we measure 19 modes with frequencies and symmetries consistent with Density Functional Theory calculations. We show that these tensor elements vary substantially in a small energy range which reflects a strong variation of the electron–phonon coupling for these modes.
- Subjects :
- Phonon
Science
Weyl semimetal
02 engineering and technology
01 natural sciences
Article
Condensed Matter::Materials Science
symbols.namesake
0103 physical sciences
Condensed-matter physics
010306 general physics
Topological matter
Theory and computation
Physics
Multidisciplinary
Condensed matter physics
Scattering
Fermi energy
021001 nanoscience & nanotechnology
Semimetal
symbols
Medicine
Condensed Matter::Strongly Correlated Electrons
Density functional theory
van der Waals force
0210 nano-technology
Raman spectroscopy
Subjects
Details
- ISSN :
- 20452322
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Scientific Reports
- Accession number :
- edsair.doi.dedup.....95b2a0d1aa7b6425f49f1653a4e1c3e7