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Title: Anisotropic electrodynamics of type-II Weyl semimetal candidate WTe 2

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [1];  [1];  [3];  [4]
  1. Univ. of California, San Diego, CA (United States). Dept. of Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Condensed Matter Physics and Materials Science
  3. Princeton Univ., NJ (United States). Dept. of Chemistry
  4. Univ. of California, San Diego, CA (United States). Dept. of Physics; Columbia Univ., New York, NY (United States). Dept. of Physics

We investigated the ab-plane optical properties of single crystals of WTe2 for light polarized parallel and perpendicular to the W-chain axis over a broad range of frequency and temperature. At far-infrared frequencies, we observed a striking dependence of the reflectance edge on light polarization, corresponding to anisotropy of the carrier effective masses. We quantitatively studied the temperature dependence of the plasma frequency, revealing a modest increase of the effective mass anisotropy in the ab plane upon cooling. We also found strongly anisotropic interband transitions persisting to high photon energies. These results were analyzed by comparison with ab initio calculations. The calculated and measured plasma frequencies agree to within 10% for both polarizations, while the calculated interband conductivity shows excellent agreement with experiment.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation
Grant/Contract Number:
SC0012704; DMR1420541; DMR1609096
OSTI ID:
1376187
Alternate ID(s):
OSTI ID: 1372532
Report Number(s):
BNL-114173-2017-JA; PRBMDO; R&D Project: PO016; KC0202020; TRN: US1702802
Journal Information:
Physical Review. B, Vol. 95, Issue 24; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Cited By (17)

Optical conductivity of the Weyl semimetal NbP text January 2018
Deterministic Scheme for Two-Dimensional Type-II Dirac Points and Experimental Realization in Acoustics journal February 2020
Temperature-induced inversion of the spin-photogalvanic effect in WTe 2 and MoTe 2 journal September 2018
Experimental progress on layered topological semimetals journal April 2019
Linear-in-Frequency Optical Conductivity in GdPtBi due to Transitions near the Triple Points journal October 2018
Optical signatures of Dirac nodal lines in NbAs 2 journal December 2018
Optical conductivity of the Weyl semimetal NbP journal November 2018
Anisotropic Broadband Photoresponse of Layered Type-II Weyl Semimetal MoTe 2 journal April 2018
Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions journal January 2020
Giant optical activity and Kerr effect in type-I and type-II Weyl semimetals journal August 2019
Ultrafast broadband optical spectroscopy for quantifying subpicometric coherent atomic displacements in WTe 2 journal December 2019
Lorentz ratio of a compensated metal journal December 2018
Room-Temperature Anisotropic Plasma Mirror and Polarization-Controlled Optical Switch Based on Type-II Weyl Semimetal WP 2 journal January 2020
Optical evidence of the type-II Weyl semimetals MoTe 2 and WTe 2 journal May 2019
Experimental Progress on Layered Topological Semimetals text January 2019
The Optical Properties and Plasmonics of Anisotropic 2D Materials journal September 2019
Optical Signatures of Dirac Nodal-lines in NbAs$_2$ text January 2018

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