High-energy excitonic effects in graphite and graphene
Materials Science
2015-05-14 v2 Other Condensed Matter
Abstract
We present ab initio many-body calculations of the optical absorption in bulk graphite, graphene and bilayer of graphene. Electron-hole interaction is included solving the Bethe-Salpeter equation on top of a GW quasiparticle electronic structure. For all three systems, we observe strong excitonic effects at high energy, well beyond the continuum of \pi -> \pi * transitions. In graphite, these affect the onset of \sigma -> \sigma * transitions. In graphene, we predict an excitonic resonance at 8.3 eV arising from a background continuum of dipole forbidden transitions. In the graphene bilayer, the resonance is shifted to 9.6 eV. Our results for graphite are in good agreement with experiments.
Keywords
Cite
@article{arxiv.0909.1682,
title = {High-energy excitonic effects in graphite and graphene},
author = {Paolo E. Trevisanutto and Markus Holzmann and Michel Cote and Valerio Olevano},
journal= {arXiv preprint arXiv:0909.1682},
year = {2015}
}
Comments
4 pages, 4 figures