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While preserving many of the unusual features of single-layer graphene,few-layer graphene (FLG) provides a richness and flexibility of electronicstructure that render this set of materials of great interest for bothfundamental studies and applications. Essential for progress, however, is anunderstanding of the evolution of the electronic structure of these materialswith increasing layer number. In this report, the evolution of the electronicstructure of FLG, for N = 1 - 8 atomic layers, has been characterized bymeasurements of the optical conductivity spectra. For each layer thickness N,distinctive peaks are found in the infrared range, with positions obeying asimple scaling relation. The observations are explained by a unifiedzone-folding scheme that generates the electronic structure for all FLGmaterials from that of bulk graphite.

The Electronic Structure of Few-Layer Graphene: Probing the Evolution from a 2-Dimensional to a 3-Dimensional Material