Plasmons and The Spectral Function of Graphene

ORAL

Abstract

We report on a theoretical study of the influence of electron-electron interactions on the one-particle Green's function of a doped graphene sheet based on the random-phase-approximation and on graphene's massless Dirac equation continuum model. We find that states near the Dirac point interact strongly with plasmons with a characteristic frequency $\omega^\star_{\rm pl}$ that scales with the sheet's Fermi energy and depends on its interaction coupling constant $\alpha_{\rm gr}$, partially explaining prominent features of recent ARPES data.

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Authors

  • Marco Polini

    NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy, NEST-CNR-INFM and Scuola Normale Superiore, Italy

  • Reza Asgari

    Institute for Studies in Theoretical Physics and Mathematics, Tehran 19395-5531, Iran

  • Giovanni Borghi

    NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy, NEST-CNR-INFM and Scuola Normale Superiore, Italy

  • Barlas Yafis

    Department of Physics, The University of Texas at Austin, Austin Texas 78712, University of Texas at Austin

  • T. Pereg-Barnea

    University of Texas at Austin, Department of Physics, The University of Texas at Austin, Austin Texas 78712

  • Allan MacDonald

    University of Texas at Austin, University of Texas, Dept. of Physics, Univ. of Texas at Austin, Department of Physics, University of Texas, Austin, TX 78712, Department of Physics, The University of Texas at Austin, Austin Texas 78712, The University of Texas at Austin, Department of Physics, University of Texas at Austin