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Abstract: The symmetry group analysis is applied to classify the phonon modes of$N$-stacked graphene layers NSGL-s with AB- and AA-stacking, particularlytheir infra-red and Raman properties. The dispersions of various phonon modesare calculated in a multi-layer vibrational model, which is generalized fromthe lattice vibrational potentials of graphene to including the inter-layerinteractions in NSGL-s. The experimentally reported red shift phenomena in thelayer number dependence of the intra-layer optical C-C stretching modefrequencies are interpreted. An interesting low frequency inter-layer opticalmode is revealed to be Raman or Infra-red active in even or odd NSGL-srespectively. Its frequency shift is sensitive to the layer number andsaturated at about 10 layers.



Autor: Jin-Wu Jiang, Hui Tang, Bing-Shen Wang, Zhao-Bin Su

Fuente: https://arxiv.org/







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