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Title: Optical conductivity of the type-II Weyl semimetal TaIrTe 4

Abstract

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.

Authors:
 [1];  [1];  [2];  [3];  [1];  [4];  [4];  [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Univ. of Freiburg (Germany)
  2. Univ. of Freiburg (Germany); Ecole Polytechnique Federale Lausanne (Switzlerland)
  3. Ecole Polytechnique Federale Lausanne (Switzlerland)
  4. Univ. of Zagreb (Croatia)
  5. Univ. of Freiburg (Germany); Univ. of Zagreb (Croatia)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1635478
Report Number(s):
BNL-216098-2020-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 102; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Le Mardelé, F., Santos-Cottin, D., Martino, E., Semeniuk, K., David, S. Ben, Orbanić, F., Novak, M., Rukelj, Z., Homes, C. C., and Akrap, Ana. Optical conductivity of the type-II Weyl semimetal TaIrTe4. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevB.102.045201.
Le Mardelé, F., Santos-Cottin, D., Martino, E., Semeniuk, K., David, S. Ben, Orbanić, F., Novak, M., Rukelj, Z., Homes, C. C., & Akrap, Ana. Optical conductivity of the type-II Weyl semimetal TaIrTe4. United States. https://doi.org/10.1103/PhysRevB.102.045201
Le Mardelé, F., Santos-Cottin, D., Martino, E., Semeniuk, K., David, S. Ben, Orbanić, F., Novak, M., Rukelj, Z., Homes, C. C., and Akrap, Ana. Mon . "Optical conductivity of the type-II Weyl semimetal TaIrTe4". United States. https://doi.org/10.1103/PhysRevB.102.045201. https://www.osti.gov/servlets/purl/1635478.
@article{osti_1635478,
title = {Optical conductivity of the type-II Weyl semimetal TaIrTe4},
author = {Le Mardelé, F. and Santos-Cottin, D. and Martino, E. and Semeniuk, K. and David, S. Ben and Orbanić, F. and Novak, M. and Rukelj, Z. and Homes, C. C. and Akrap, Ana},
abstractNote = {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.},
doi = {10.1103/PhysRevB.102.045201},
journal = {Physical Review B},
number = 4,
volume = 102,
place = {United States},
year = {2020},
month = {7}
}

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Works referenced in this record:

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