Optical conductivity of the type-II Weyl semimetal TaIrTe${}_4$

Abstract

TaIrTe${}_4$ is an example of a candidate Weyl type-II semimetal with a minimal possible number of Weyl nodes. Four nodes are reported to exist a single plane in $k$-space. The existence of a conical dispersion linked to Weyl nodes has yet to be shown experimentally. Here we use optical spectroscopy as a probe of the band structure on a low-energy scale. Studying optical conductivity allows us to probe intraband and interband transitions with zero momentum. In TaIrTe${}_4$, we observe a narrow Drude contribution and an interband conductivity that may be consistent with a tilted linear band dispersion up to 40~meV. The interband conductivity allows us to establish the effective parameters of the conical dispersion; effective velocity $v=1.1\cdot 10^4$~m/s and tilt $\gamma =0.37$. The transport data, Seebeck and Hall coefficients, are qualitatively consistent with conical features in the band structure. Quantitative disagreement may be linked to the multiband nature of TaIrTe${}_4$.

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Cited by in corpus (4)

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• Evidence of 3D Dirac conical bands in TlBiSSe by optical and magneto-optical spectroscopy
• Optical conductivity of the type-II Weyl semimetal WTe${}_2$ under pressure
• A Raman Probe of Phonons and Electron-phonon Interactions in NbIrTe4