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Title: Two-dimensional conical dispersion in ZrTe 5 evidenced by optical spectroscopy

Abstract

Zirconium pentatelluride was recently reported to be a 3D Dirac semimetal, with a single conical band, located at the center of the Brillouin zone. The cone’s lack of protection by the lattice symmetry immediately sparked vast discussions about the size and topological/trivial nature of a possible gap opening. Here we report on a combined optical and transport study of ZrTe 5, which reveals an alternative view of electronic bands in this material. We conclude that the dispersion is approximately linear only in the a-c plane, while remaining relatively flat and parabolic in the third direction (along the baxis). Furthermore, the electronic states in ZrTe 5 cannot be described using the model of 3D Dirac massless electrons, even when staying at energies well above the band gap 2Δ = 6 meV found in our experiments at low temperatures.

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [5];  [2];  [2];  [1];  [6];  [7];  [5]
  1. IPHYS, EPFL, Lausanne (Switzerland)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. CNRS-UGA-UPS-INSA, Grenoble (France)
  4. Vienna Univ. of Technology, Vienna (Australia)
  5. Univ. of Fribourg, Fribourg (Switzerland)
  6. Univ. of Zagreb, Zagreb (Croatia)
  7. CNRS-UGA-UPS-INSA-EMFL, Grenoble (France); Univ. in Prague, Prague (Czech Republic)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1513221
Alternate Identifier(s):
OSTI ID: 1523321
Report Number(s):
BNL-211600-2019-JAAM
Journal ID: ISSN 0031-9007
Grant/Contract Number:  
SC0012704; KK.01.1.1.01.0004
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Martino, E., Homes, C C., Crassee, I., Eguchi, G., Santos-Cottin, D., Zhong, R. D., Gu, G. D., Berger, H., Rukelj, Z., Orlita, M., and Akrap, Ana. Two-dimensional conical dispersion in ZrTe5 evidenced by optical spectroscopy. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.217402.
Martino, E., Homes, C C., Crassee, I., Eguchi, G., Santos-Cottin, D., Zhong, R. D., Gu, G. D., Berger, H., Rukelj, Z., Orlita, M., & Akrap, Ana. Two-dimensional conical dispersion in ZrTe5 evidenced by optical spectroscopy. United States. doi:10.1103/PhysRevLett.122.217402.
Martino, E., Homes, C C., Crassee, I., Eguchi, G., Santos-Cottin, D., Zhong, R. D., Gu, G. D., Berger, H., Rukelj, Z., Orlita, M., and Akrap, Ana. Wed . "Two-dimensional conical dispersion in ZrTe5 evidenced by optical spectroscopy". United States. doi:10.1103/PhysRevLett.122.217402.
@article{osti_1513221,
title = {Two-dimensional conical dispersion in ZrTe5 evidenced by optical spectroscopy},
author = {Martino, E. and Homes, C C. and Crassee, I. and Eguchi, G. and Santos-Cottin, D. and Zhong, R. D. and Gu, G. D. and Berger, H. and Rukelj, Z. and Orlita, M. and Akrap, Ana},
abstractNote = {Zirconium pentatelluride was recently reported to be a 3D Dirac semimetal, with a single conical band, located at the center of the Brillouin zone. The cone’s lack of protection by the lattice symmetry immediately sparked vast discussions about the size and topological/trivial nature of a possible gap opening. Here we report on a combined optical and transport study of ZrTe5, which reveals an alternative view of electronic bands in this material. We conclude that the dispersion is approximately linear only in the a-c plane, while remaining relatively flat and parabolic in the third direction (along the baxis). Furthermore, the electronic states in ZrTe5 cannot be described using the model of 3D Dirac massless electrons, even when staying at energies well above the band gap 2Δ = 6 meV found in our experiments at low temperatures.},
doi = {10.1103/PhysRevLett.122.217402},
journal = {Physical Review Letters},
number = 21,
volume = 122,
place = {United States},
year = {2019},
month = {5}
}

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