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

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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.

Original languageEnglish
Article number205422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number20
DOIs
StatePublished - 17 Nov 2014

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