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arxiv: 1610.04671 · v1 · pith:QZBJIXTL · submitted 2016-10-15 · cond-mat.mtrl-sci

Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2

Yilei Li , Alexey Chernikov , Xian Zhang , Albert Rigosi , Heather M. Hill , Arend M. van der Zande , Daniel A. Chenet , En-Min Shih
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James Hone Tony F. Heinz
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classification cond-mat.mtrl-sci
keywords dielectricmonolayersfunctionmetalmos2mose2transitionwse2
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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 - 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.

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