论文标题
二层石墨烯中的电子拉曼散射
Electronic Raman Scattering in Twistronic Few-Layer Graphene
论文作者
论文摘要
我们研究了对两层，三层和四层石墨烯的拉曼散射信号的电子贡献，其层在一个接口之一处，相互扭曲的界面之一。我们发现，这些系统的拉曼光谱具有由vistronic石墨烯的MoiréMinibands产生的两个峰，一种与Dirac State的直接杂交有关，另一个是由MoiréSupertrattice引起的带折叠产生的。两个峰的位置在很大程度上取决于扭曲角度，因此即使在HBN包含的结构中，它们也可以用于扭曲的非侵入性表征。
We study electronic contribution to the Raman scattering signals of two-, three- and four-layer graphene with layers at one of the interfaces twisted by a small angle with respect to each other. We find that the Raman spectra of these systems feature two peaks produced by van Hove singularities in moiré minibands of twistronic graphene, one related to direct hybridization of Dirac states, and the other resulting from band folding caused by moiré superlattice. The positions of both peaks strongly depend on the twist angle, so that their detection can be used for non-invasive characterization of the twist, even in hBN-encapsulated structures.
