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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学術論文

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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引用

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

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

要旨

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.