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

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

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

Abstract

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.

Details

Original languageEnglish
Article number205422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number20
Publication statusPublished - 17 Nov 2014
Peer-reviewedYes
Externally publishedYes