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  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., 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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-A79B-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-A79F-5
Genre: Journal Article

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Politano, A., Author
Radovic, I., Author
Borka, D., Author
Miskovic, Z. L., Author
Yu, H. K.1, Author              
Farias, D., Author
Chiarello, G., Author
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1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              

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 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.

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Language(s): eng - English
 Dates: 2016-11-292017-04
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.carbon.2016.11.073
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Title: Carbon
Source Genre: Journal
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Pages: - Volume / Issue: 114 Sequence Number: - Start / End Page: 70 - 76 Identifier: -