Electronic excitations in graphene in the 1-50 eV range: the π and π + σ peaks are not plasmons

Nano Lett. 2014 Jul 9;14(7):3827-31. doi: 10.1021/nl500969t. Epub 2014 Jun 6.

Abstract

The field of plasmonics relies on light coupling strongly to plasmons as collective excitations. The energy loss function of graphene is dominated by two peaks at ∼5 and ∼15 eV, known as π and π + σ plasmons, respectively. We use electron energy-loss spectroscopy in an aberration-corrected scanning transmission electron microscope and density functional theory to show that between 1 to 50 eV, these prominent π and π + σ peaks are not plasmons, but single-particle interband excitations.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.