Optical properties of graphene
Optical properties of graphene
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DOI：
10.1142/10255
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
R. Binder
中科院分区：
文献类型：
--
作者：
R. Binder
从理论角度综述了石墨烯的拉曼光谱。在引入了电子能带结构、声子色散、电子-声子相互作用、电子-光耦合等基本概念后，利用含时微扰理论计算了拉曼强度。对贡献项的分析允许对拉曼峰位置和强度的直观理解。纯石墨烯的拉曼光谱仅显示两个主峰。然而，它们作为内部和外部参数的函数的变化以及与缺陷相关的二次峰的出现传达了关于系统的大量信息。因此，常规地使用拉曼光谱来分析石墨烯样品的层数、缺陷、掺杂和应变。与此同时，石墨烯的光学性质的研究也是一个有趣的领域。
Raman spectroscopy of graphene is reviewed from a theoretical perspective. After an introduction of the building blocks (electronic band structure, phonon dispersion, electron-phonon interaction, electron-light coupling), Raman intensities are calculated using time-dependent perturbation theory. The analysis of the contributing terms allows for an intuitive understanding of the Raman peak positions and intensities. The Raman spectrum of pure graphene only displays two principle peaks. Yet, their variation as a function of internal and external parameters and the occurrence of secondary, defect-related peaks, conveys a lot of information about the system. Thus, Raman spectroscopy is used routinely to analyze layer number, defects, doping and strain of graphene samples. At the same time, it is an intriguing playground to study the optical properties of graphene.