| Autor: |
Mardelé, F. Le, Santos-Cottin, D., Martino, E., Semeniuk, K., David, S. Ben, Orbanic, F., Novak, M., Rukelj, Z., Homes, C. C., Akrap, Ana |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 102, 045201 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.102.045201 |
| Popis: |
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$_4$. |
| Databáze: |
arXiv |
| Externí odkaz: |
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