Electronic excitations in graphene in the 1-50 eV range: the π and π + σ peaks are not plasmons.
basic_science · Level V
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- Record sourced from PubMed, PMID 24884760.
- Also identified by DOI 10.1021/nl500969t.
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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.