Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) foils
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2017
Authors
Politano, AntonioRadović, Ivan
Borka, Duško
Mišković, Zoran L.
Yu, H. K.
Farias, D.
Chiarello, G.
Article (Published version)
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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. (C) 2016 Elsevier Ltd. All rights reserved.
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Carbon, 2017, 114, 70-76Funding / projects:
- Functional, Functionalized and Advanced Nanomaterials (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45005)
- COST Action [MP1306]
- Natural Sciences and Engineering Research Council of Canada [249506-2011]
- Spanish MINECO [MAT2015-65356-C3-3-R]
- Spanish MINECO through the Maria de Maeztu Programme for Units of Excellence in RD [MDM-2014-0377]
DOI: 10.1016/j.carbon.2016.11.073
ISSN: 0008-6223; 1873-3891
WoS: 000393249600009
Scopus: 2-s2.0-85003554341
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VinčaTY - JOUR AU - Politano, Antonio AU - Radović, Ivan AU - Borka, Duško AU - Mišković, Zoran L. AU - Yu, H. K. AU - Farias, D. AU - Chiarello, G. PY - 2017 UR - https://vinar.vin.bg.ac.rs/handle/123456789/1414 AB - 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. (C) 2016 Elsevier Ltd. All rights reserved. T2 - Carbon T1 - Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) foils VL - 114 SP - 70 EP - 76 DO - 10.1016/j.carbon.2016.11.073 ER -
@article{ author = "Politano, Antonio and Radović, Ivan and Borka, Duško and Mišković, Zoran L. and Yu, H. K. and Farias, D. and Chiarello, G.", year = "2017", 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. (C) 2016 Elsevier Ltd. All rights reserved.", journal = "Carbon", title = "Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) foils", volume = "114", pages = "70-76", doi = "10.1016/j.carbon.2016.11.073" }
Politano, A., Radović, I., Borka, D., Mišković, 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. in Carbon, 114, 70-76. https://doi.org/10.1016/j.carbon.2016.11.073
Politano A, Radović I, Borka D, Mišković ZL, Yu HK, Farias D, Chiarello G. Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) foils. in Carbon. 2017;114:70-76. doi:10.1016/j.carbon.2016.11.073 .
Politano, Antonio, Radović, Ivan, Borka, Duško, Mišković, Zoran L., Yu, H. K., Farias, D., Chiarello, G., "Dispersion and damping of the interband pi plasmon in graphene grown on Cu(111) foils" in Carbon, 114 (2017):70-76, https://doi.org/10.1016/j.carbon.2016.11.073 . .