This paper takes a fundamental view of the electron energy loss spectra of monolayer and few layer MoS2 . The dielectric function of monolayer MoS2 is compared to the experimental spectra to give clear criteria for the nature of different signals. Kramers-Krönig analysis allows a direct extraction of the dielectric function from the experimental data. However this analysis is sensitive to slight changes in the normalisation step of the data pre-treatment. Density functional theory provides simulations of the dielectric function for comparison and validation of experimental findings. Simulated and experimental spectra are compared to isolate the π and π + σ surface plasmon modes in monolayer MoS2 . Single-particle excitations obscure the plasmons in the monolayer spectrum and momentum resolved measurements give indication of indirect interband transitions that are excited due to the large convergence and collection angles used in the experiment. This article is protected by copyright. All rights reserved.

中文翻译：

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通过能量损失光谱的实验和理论相关性研究 MoS2 中的等离子体

本文对单层和少层二硫化钼的电子能量损失谱进行了基本的研究。将单层 MoS2 的介电函数与实验光谱进行比较，以给出不同信号性质的明确标准。Kramers-Krönig 分析允许从实验数据中直接提取介电函数。然而，这种分析对数据预处理的标准化步骤中的细微变化很敏感。密度泛函理论提供介电函数的模拟，用于比较和验证实验结果。比较模拟和实验光谱以分离单层 MoS2 中的 π 和 π + σ 表面等离子体模式。单粒子激发掩盖了单层光谱中的等离子激元，动量分辨测量表明由于实验中使用的大会聚角和收集角而激发的间接带间跃迁。本文受版权保护。版权所有。