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Excitonic Effects in the Optical Spectra of Graphene Nanoribbons
We present a first-principles calculation of the optical properties of armchair-edged graphene nanoribbons (AGNRs) with many-electron effects included. The reduced dimensionality of the AGNRs gives rise to an enhanced electron−hole binding energy for both bright and dark exciton states (0.8−1.4 eV for GNRs with width ∼1.2 nm) and dramatically changes …