Two-phonon Raman scattering in graphene for laser excitation beyond the π-plasmon energy

INERA Conference: Vapor Phase Technologies for Metal Oxide and Carbon Nanostructures

物理学;材料科学

Popov, Valentin N.^1

Faculty of Physics, University of Sofia, Sofia

BG-1164, Bulgaria^1

关键词: Brillouin zones;    Near ultraviolet;    Phonon dispersions;    Plasmon energy;    Raman data;    Raman measurements;    Visible range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/764/1/012008/pdf
DOI  :  10.1088/1742-6596/764/1/012008

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The study of the two-phonon Raman spectra of graphene allows obtaining valuable information about the phonon dispersion inside the Brillouin zone. Up to now, the two-phonon Raman spectra have been extensively measured and modelled for laser excitation mainly in the visible range. However, recently, Raman measurements have been reported for laser excitation in the near ultraviolet range, close to the π-plasmon energy of about 5 eV. Here, we calculate the two-phonon Raman spectra in the latter range and compare the obtained results to the available Raman data. The crossover behaviour of the scattering of electrons by phonons on passing the π-plasmon energy is also discussed.