Optical conductivity of the type-II Weyl semimetal TaIrTe4 (CROSBI ID 284454)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Le Mardelé, F. ; Santos-Cottin, D. ; Martino, E. ; Semeniuk, K. ; David, S. Ben ; Orbanić, F. ; Novak, M. ; Rukelj, Z. ; Homes, C. C. ; Akrap, Ana
engleski
Optical conductivity of the type-II Weyl semimetal TaIrTe4
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 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.
Weyl semimetal, optical conductivity
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Podaci o izdanju
102 (4)
2020.
045201
6
objavljeno
2469-9950
2469-9969
10.1103/physrevb.102.045201