Exciton effects in armchair graphene nanoribbons
College of Physics and Electronic Engineering, Xinyang Normal
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Received in final form: 10 July 2011
Published online: 17 October 2011
We have studied the exciton effects in armchair graphene nanoribbons systematically, using the nonorthogonal tight-binding model supplement by the long-range Coulomb interactions. It is found from our calculations that the excitation energies, the exciton binding energies and the exciton wave function sizes of the E11 and E22 excitons all exhibit oscillation as a function of the ribbon width. And there is a phase shift of π between the oscillation of the E11 and E22 excitons.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2011