Localized π Electronic Edge State in Nanographite

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Abstract
Graphite fragments on a nanometer scale can present a distinctive edge state depending on the edge shape. By examining the electronic band structure of graphite ribbons within the Pariser-Parr-Pople model, we study the effect of the electron-electron interaction on the edge state. Depending on the ribbon width N, the long-range Coulomb interaction affects the edge state of narrow ribbons. The characteristics of the edge state, however, still persist in zigzag ribbons of a few nanometer width. Recent experimental approaches to synthesize nanographite are also introduced.