Electronic Excitations in Graphene in the 1–50 eV Range: The π and π + σ Peaks Are Not Plasmons
Nano Letters2014Vol. 14(7), pp. 3827–3831
Citations Over TimeTop 10% of 2014 papers
Florence Nelson, Juan Carlos Idrobo, John D. Fite, Z. L. Mišković, Stephen J. Pennycook, Sokrates T. Pantelides, Ji Ung Lee, Alain C. Diebold
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.
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