Optical properties of the perfectly compensated semimetal WTe2

C. C. Homes, M. N. Ali, R. J. Cava

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

The optical properties of layered tungsten ditelluride have been measured over a wide temperature and frequency range for light polarized in the a-b planes. A striking low-frequency plasma edge develops in the reflectance at low temperature where this material is a perfectly compensated semimetal. The optical conductivity is described using a two-Drude model which treats the electron and hole pockets as separate electronic subsystems. At low temperature, one scattering rate collapses by over two orders of magnitude, while the other also undergoes a significant, but less dramatic, decrease; both scattering rates appear to display the quadratic temperature dependence expected for a Fermi liquid. First principles electronic structure calculations reveal that the low-lying optical excitations are due to direct transitions between the bands associated with the electron and hole pockets.

Original languageEnglish (US)
Article number161109
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number16
DOIs
StatePublished - Oct 12 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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