Measurement of the optical dielectric function of monolayer transition-metal dichalcogenides: MoS2, Mo S e2, WS2, and WS e2

Yilei Li, Alexey Chernikov, Xian Zhang, Albert Rigosi, Heather M. Hill, Arend M. Van Der Zande, Daniel A. Chenet, En Min Shih, James Hone, Tony F. Heinz

Research output: Contribution to journalArticle


We report a determination of the complex in-plane dielectric function of monolayers of four transition-metal dichalcogenides: MoS2, MoSe2, WS2, and WSe2, for photon energies from 1.5 to 3 eV. The results were obtained from reflection spectra using a Kramers-Kronig constrained variational analysis. From the dielectric functions, we obtain the absolute absorbance of the monolayers. We also provide a comparison of the dielectric function for the monolayers with the corresponding bulk materials.

Original languageEnglish (US)
Article number205422
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number20
StatePublished - Nov 17 2014
Externally publishedYes


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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