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Author Morozov, Yurii V. ♦ Kuno, Masaru
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ABSORPTIVITY ♦ CURRENTS ♦ DIELECTRIC MATERIALS ♦ FREQUENCY DEPENDENCE ♦ HOLES ♦ KRAMERS-KRONIG CORRELATION ♦ MOLYBDENUM SELENIDES ♦ MOLYBDENUM SULFIDES ♦ PERMITTIVITY ♦ REFRACTIVE INDEX ♦ TRANSITION ELEMENTS
Abstract The complex optical constants of single layer MoS{sub 2}, MoSe{sub 2}, and WSe{sub 2} transition metal dichalcogenides (TMDCs) have been measured using concerted frequency-dependent transmittance and reflectance measurements. Absolute absorptivities as well as complex refractive indices and dielectric permittivities have been extracted. Comparisons to associated bulk responses reveal differences due to increased electron-hole interactions in single layer TMDCs. In parallel, corresponding complex optical conductivities (σ) have been determined. For MoS{sub 2}, extracted σ-values qualitatively agree with recent theoretical estimates. Significant differences exist, though, between experiment and theory regarding the imaginary part of σ. In all cases, the current approach distinguishes itself to other measurements of single layer TMDC optical constants in which it does not rely on Kramers-Kronig transformations of reflectance data.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-08-24
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 8


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