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Phys. Rev. Lett. 102, 076803 (2009) [4 pages]

First-Principles Study of Electron Linewidths in Graphene

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Cheol-Hwan Park1,2, Feliciano Giustino1,2,3, Catalin D. Spataru4, Marvin L. Cohen1,2, and Steven G. Louie1,2,*
1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
2Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
3Department of Materials, University of Oxford, Oxford , OX1 3PH, United Kingdom
4Sandia National Laboratories, Livermore, California 94551, USA

See Also: Erratum

Received 24 September 2008; published 20 February 2009

We present first-principles calculations of the linewidths of low-energy quasiparticles in n-doped graphene arising from both the electron-electron and the electron-phonon interactions. The contribution to the electron linewidth arising from the electron-electron interactions varies significantly with wave vector at fixed energy; in contrast, the electron-phonon contribution is virtually wave vector independent. These two contributions are comparable in magnitude at a binding energy of ∼0.2  eV, corresponding to the optical phonon energy. The calculated linewidths, with both electron-electron and electron-phonon interactions included, explain to a large extent the linewidths seen in recent photoemission experiments.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.076803
DOI:
10.1103/PhysRevLett.102.076803
PACS:
73.21.Ac, 71.38.−k, 73.63.−b, 79.60.Jv

*sglouie@berkeley.edu

See Also

Erratum: Cheol-Hwan Park, Feliciano Giustino, Catalin D. Spataru, Marvin L. Cohen, and Steven G. Louie, Erratum: First-Principles Study of Electron Linewidths in Graphene [Phys. Rev. Lett. 102, 076803 (2009)], Phys. Rev. Lett. 102, 189904 (2009).

 
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