Optical conductivity of the type-II Weyl semimetal
- 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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1635478
- Report Number(s):
- BNL-216098-2020-JAAM; PRBMDO; TRN: US2201574
- Journal Information:
- Physical Review B, Vol. 102, Issue 4; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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