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This content will become publicly available on June 30, 2018

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

We investigated the ab-plane optical properties of single crystals of WTe 2 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.
Authors:
 [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
Publication Date:
Report Number(s):
BNL-114173-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PO016; KC0202020; TRN: US1702802
Grant/Contract Number:
SC0012704; DMR1420541; DMR1609096
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Gordon and Betty Moore Foundation
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1376187
Alternate Identifier(s):
OSTI ID: 1372532