Abstract
The frequency shift of the Raman G peak of epitaxial graphene due to the interaction with a substrate described by effective bond force constant k is investigated using the model of two coupled oscillators. The relative G-peak shift is shown to be Δω(G)/ω(G) ∝ k/k0g, where k0g is the bond-stretching force constant of single-layer graphene. Assuming k ∝ P and k ∝–T, where P and T are the pressure and temperature, and the k variation to be dominant, we qualitatively explain the experimental dependences of Δω(G) on P and T. The effect of the substrate on the G-peak broadening in epitaxial graphene is discussed.
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Original Russian Text © S.Yu. Davydov, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 3, pp. 610–613.
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Davydov, S.Y. On Estimating the G-peak shift in graphene Raman spectra. Phys. Solid State 59, 629–632 (2017). https://doi.org/10.1134/S1063783417030088
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DOI: https://doi.org/10.1134/S1063783417030088