Measurement of the optical dielectric function of monolayer transition-metal dichalcogenides: MoS2, MoSe2, WS2, and WSe2

被引：1133

作者：

Li, Yilei ^{[1
,2
]}

Chernikov, Alexey ^{[1
,2
]}

Zhang, Xian ^{[3
]}

Rigosi, Albert ^{[1
,2
]}

Hill, Heather M. ^{[1
,2
]}

van der Zande, Arend M. ^{[3
,4
]}

Chenet, Daniel A. ^{[3
]}

Shih, En-Min ^{[1
,2
]}

Hone, James ^{[3
]}

Heinz, Tony F. ^{[1
,2
]}

机构：

[1] Columbia Univ, Dept Phys, New York, NY 10027 USA

[2] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA

[3] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[4] Columbia Univ, Energy Frontier Res Ctr, New York, NY 10027 USA

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 20期

基金：

美国国家科学基金会;

关键词：

KRAMERS-KRONIG ANALYSIS; LARGE-AREA; 2-DIMENSIONAL MATERIALS; REFLECTIVITY SPECTRA; VALLEY POLARIZATION; ATOMIC LAYERS; DIODES; GROWTH;

D O I：

10.1103/PhysRevB.90.205422

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：6

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