Mardelé, F. Le Santos-Cottin, D. Martino, E. Semeniuk, K. David, S. Ben Orbanić, F. Novak, Mark Rukelj, Z. Homes, C. C. Akrap, Ana 2020-07-06 TaIrTe4 is an example of a candidate Weyl type-II semimetal with a minimal possible number of Weyl nodes. Four nodes are reported to exist in a single plane in k space. The existence of a conical dispersion linked toWeyl 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 TaIrTe4, 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 × 104 m/s and tilt γ = 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 TaIrTe4. application/pdf https://folia.unifr.ch/global/documents/308728 https://folia.unifr.ch/documents/308728/files/akr_oct.pdf https://folia.unifr.ch/documents/308728/files/akr_oct_sm.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.102.045201 info:eu-repo/semantics/openAccess License undefined Physical Review B. - 2020, vol. 102, no. 4, p. 045201 info:eu-repo/classification/udc/53 Optical conductivity of the type-II Weyl semimetal TaIrTe⁴ http://purl.org/coar/resource_type/c_6501