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Excitonic Effects on the Optical Response of Graphene and Bilayer Graphene

Cited 550 time in Web of Science Cited 582 time in Scopus
Authors

Yang, Li; Deslippe, Jack; Park, Cheol-Hwan; Cohen, Marvin L.; Louie, Steven G.

Issue Date
2009-10
Publisher
American Physical Society
Citation
Physical Review Letters, Vol.103 No.18, p. 186802
Abstract
We present first-principles calculations of many-electron effects on the optical response of graphene, bilayer graphene, and graphite employing the GW-Bethe Salpeter equation approach. We find that resonant excitons are formed in these two-dimensional semimetals. The resonant excitons give rise to a prominent peak in the absorption spectrum near 4.5 eV with a different line shape and significantly redshifted peak position from those of an absorption peak arising from interband transitions in an independent quasiparticle picture. In the infrared regime, our calculated optical absorbance per graphene layer is approximately a constant, 2.4%, in agreement with recent experiments; additional low frequency features are found for bilayer graphene because of band structure effects. © 2009 The American Physical Society.
ISSN
0031-9007
URI
https://hdl.handle.net/10371/202370
DOI
https://doi.org/10.1103/PhysRevLett.103.186802
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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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