Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) 
foils.

Politano, A.; Radovic, I.; Borka, D.; Miskovic, Z. L.; Yu, H. K.; Farias, D.; Chiarello, G.

doi:10.1016/j.carbon.2016.11.073

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Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) foils.

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Yu, H. K.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Politano, A., Radovic, I., Borka, D., Miskovic, Z. L., Yu, H. K., Farias, D., et al. (2017). Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) foils. Carbon, 114, 70-76. doi:10.1016/j.carbon.2016.11.073.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-A79B-D

Abstract

By means of angle-resolved electron energy loss spectroscopy, we have measured the interband it plasmon in high-quality graphene grown on peeled-off epitaxial Cu(111) foils. Experimental loss spectra have been reproduced by means of a hydrodynamic model. The dispersion relation of the plasmon frequency shows a nearly-flat dispersion up to a critical wave-vector of 0.3 angstrom(-1). We propose that the observed behavior could be originated by confinement effects in ripples in the strained graphene sheet. Strain also limits the dispersion at higher momenta, as a consequence of the increased effective mass of charge carriers. The analysis of momentum dependence of the line-width and of the inverse quality factor indicates that damping processes are dominated by decay in electron-hole pairs via indirect interband transitions.