Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-08-02
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 5 figures
Scientific paper
While preserving many of the unusual features of single-layer graphene, few-layer graphene (FLG) provides a richness and flexibility of electronic structure that render this set of materials of great interest for both fundamental studies and applications. Essential for progress, however, is an understanding of the evolution of the electronic structure of these materials with increasing layer number. In this report, the evolution of the electronic structure of FLG, for N = 1 - 8 atomic layers, has been characterized by measurements of the optical conductivity spectra. For each layer thickness N, distinctive peaks are found in the infrared range, with positions obeying a simple scaling relation. The observations are explained by a unified zone-folding scheme that generates the electronic structure for all FLG materials from that of bulk graphite.
Heinz Tony F.
Mak Kin Fai
Misewich James A.
Sfeir Matthew Y.
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