Optical conductivity of the type-II Weyl semimetal TaIrTe<sup>4</sup>

Mardelé, F. Le; Santos-Cottin, D.; Martino, E.; Semeniuk, K.; David, S. Ben; Orbanić, F.; Novak, Mark; Rukelj, Z.; Homes, C. C.; Akrap, Ana

doi:10.1103/PhysRevB.102.045201

Back

Journal article

+ 1 other files

Optical conductivity of the type-II Weyl semimetal TaIrTe⁴

Mardelé, F. Le Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
Santos-Cottin, D. Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
Martino, E. Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland - IPHYS, EPFL, CH-1015 Lausanne, Switzerland
Semeniuk, K. IPHYS, EPFL, CH-1015 Lausanne, Switzerland
David, S. Ben Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
Orbanić, F. Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, HR-10000 Zagreb, Croatia
Novak, Mark Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, HR-10000 Zagreb, Croatia
Rukelj, Z. Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland - Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, HR-10000 Zagreb, Croatia
Homes, C. C. Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, USA
Akrap, Ana Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland

06.07.2020

Published in:

Physical Review B. - 2020, vol. 102, no. 4, p. 045201

English 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language