https://doi.org/10.1140/epjb/e2011-20491-4
Regular Article
Theoretical calculation of excitonic binding energies and optical absorption spectra for Armchair graphene nanoribbons
1
Research Institute for Applied Physics, University of
Tabriz, Tabriz
51665-163,
Iran
2
Faculty of Physics, University of Tabriz,
Tabriz,
Iran
3
School of Electrical, Electronic and Computer Engineering, The
University of Western Australia, Crawley, 6009
WA,
Australia
a e-mail: asgari@tabrizu.ac.ir
Received:
20
June
2011
Received in final form:
5
September
2011
Published online:
10
November
2011
In this paper the excitons of armchair graphene nanoribbons with layers of different width and thickness have been investigated. In this investigation, the band structure and energy gap of armchair graphene nanoribbons have been calculated using a tight-binding model including edge deformation effects (all edge atoms have been passivated with hydrogen atoms). Also, by calculating the conductance in armchair graphene nanoribbons (A-GNRs) optical absorption of armchair graphene nanoribbon in the single-electron approximation has been obtained. Finally, the binding energy of excitons in armchair graphene nanoribbons has been calculated using the Wannier model, Hartree-Fock approximation and the Bethe-Salpeter equation.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2011
