Optical conductivity of the type-II Weyl semimetal TaIrTe4

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

doi:10.1103/PhysRevB.102.045201

Title: Optical conductivity of the type-II Weyl semimetal ${TaIrTe}_{4}$

Journal Article · 05 July 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.102.045201 · OSTI ID:1635478

Le Mardelé, F. ^[1]; Santos-Cottin, D. ^[1]; Martino, E. ^[2]; Semeniuk, K. ^[3]; David, S. Ben ^[1]; Orbanić, F. ^[4]; Novak, M. ^[4]; Rukelj, Z. ^[5];

^[6];

^[1]

Univ. of Freiburg (Germany)
Univ. of Freiburg (Germany); Ecole Polytechnique Federale Lausanne (Switzlerland)
Ecole Polytechnique Federale Lausanne (Switzlerland)
Univ. of Zagreb (Croatia)
Univ. of Freiburg (Germany); Univ. of Zagreb (Croatia)
Brookhaven National Lab. (BNL), Upton, NY (United States)

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 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 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1635478

Report Number(s):: BNL--216098-2020-JAAM; {"Journal ID: ISSN 2469-9950","","Journal ID: ISSN PRBMDO"}

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 102; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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