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The semimetal NbIrTe4 has been proposed to be a Type-II Weyl semimetal with 8pairs of opposite Chirality Weyl nodes which are very close to the Fermienergy. This topological electronic structure is made possible because of thebroken inversion symmetry of NbIrTe4 which is an orthorhombic crystal with Tdsymmetry. Using micro-Raman scattering as a probe, we observe the frequenciesand symmetries of 19 phonon modes (ranging from 40 to 260 cm-1) in thismaterial and compare to Density Functional Theory calculations. Using angularand polarization resolved Raman scattering for green (514 nm) and red (633 nm)laser excitation, we show that it is possible to extract the excitation energydependence of the Raman tensor elements associated with each measurable phononmode. We show that these tensor elements vary substantially in a small energyrange which reflects a strong variation of the electron-phonon coupling forthese modes.

A Raman Probe of Phonons and Electron-phonon Interactions in NbIrTe4