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Quasiparticle energies and band gaps in graphene nanoribbons
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Web of Science
Cited 1095 time in Scopus
- Authors
- Issue Date
- 2007-11
- Publisher
- American Physical Society
- Citation
- Physical Review Letters, Vol.99 No.18, p. 186801
- Abstract
- We present calculations of the quasiparticle energies and band gaps of graphene nanoribbons (GNRs) carried out using a first-principles many-electron Green's function approach within the GW approximation. Because of the quasi-one-dimensional nature of a GNR, electron-electron interaction effects due to the enhanced screened Coulomb interaction and confinement geometry greatly influence the quasiparticle band gap. Compared with previous tight-binding and density functional theory studies, our calculated quasiparticle band gaps show significant self-energy corrections for both armchair and zigzag GNRs, in the range of 0.5-3.0 eV for ribbons of width 2.4-0.4 nm. The quasiparticle band gaps found here suggest that use of GNRs for electronic device components in ambient conditions may be viable. © 2007 The American Physical Society.
- ISSN
- 0031-9007
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