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.

–

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