Measurement of the optical dielectric function of monolayer transition-metal dichalcogenides: MoS2, MoSe2, WS2, and WSe2
Measurement of the optical dielectric function of monolayer transition-metal dichalcogenides: MoS2, MoSe2, WS2, and WSe2
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DOI：
10.1103/physrevb.90.205422
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发表时间：
2014-11-17
影响因子：
3.7
通讯作者：
Heinz, Tony F.
中科院分区：
文献类型：
--
作者：
Li, Yilei;Chernikov, Alexey;Heinz, Tony F.
我们报告了四个过渡金属二硫属化物：MoS 2，MoSe 2，WS 2和WSe 2，光子能量从1.5到3 eV的单层的复杂的面内介电函数的测定。从反射光谱使用Kramers-Kronig约束变分分析的结果。从介电函数，我们得到的绝对吸收的单分子膜。我们还提供了相应的散装材料的单层的介电函数的比较。
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.