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 ${TaIrTe}_{4}$

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:

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)

Publication Date:: 2020-07-06

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; TRN: US2201574

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.  doi:10.1103/PhysRevB.102.045201.

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                    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

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                    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.

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

Abstract

Citation Formats

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

Observation of Topological Edge States at the Step Edges on the Surface of Type-II Weyl Semimetal TaIrTe ₄
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Bipolar Conduction as the Possible Origin of the Electronic Transition in Pentatellurides: Metallic vs Semiconducting Behavior
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