https://doi.org/10.1140/epjb/e2011-20060-y
Regular Article
Exciton effects in armchair graphene nanoribbons
College of Physics and Electronic Engineering, Xinyang Normal
University, Xinyang,
464000, P.R.
China
a e-mail: jiayonglei@gmail.com
Received:
22
January
2011
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
