Figure 1
From: Exciton-dominated Dielectric Function of Atomically Thin MoS2 Films
Anomalous layer-dependence of the dielectric function of 2D MoS2.
(a,b) Real and imaginary parts of the dielectric function of 2D MoS2 vs. layer number. Also given is the dielectric function of bulk MoS2. The three peaks can be assigned to A, B and C excitons as labeled. Corresponding refractive indexes of the films are given in Fig. S6 and Table S1 of the Supplementary Information. (c) The dependence of the imaginary part ε2 of the dielectric function at the A, B and C peaks on layer number. The error bar is 5% and estimated from the measurement results of multiple samples. (d) Normalized ε2 at the A, B, and C peaks vs. layer number. The normalization is performed with respect to the corresponding value of each peak in the 5-layer MoS2. Error bar is ignored for visual convenience.
