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Quasiparticle energies and band gaps in graphene nanoribbons

Cited 1022 time in Web of Science Cited 1089 time in Scopus
Authors

Yang, Li; Park, Cheol-Hwan; Son, Young-Woo; Cohen, Marvin L.; Louie, Steven G.

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
URI
https://hdl.handle.net/10371/202423
DOI
https://doi.org/10.1103/PhysRevLett.99.186801
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  • College of Natural Sciences
  • Department of Physics and Astronomy
Research Area Condensed Matter Physics, Nanoscale Photonics, Nanoscale Physics, 나노 물리와 나노 광자학, 응집 물질 물리

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