Plasmon-plasmon interaction and the role of buffer in epitaxial graphene microflakes

0580713 - FZÚ 2024 RIV US eng J - Journal Article
Shestopalov, M. - Dědič, V. - Rejhon, M. - Morzhuk, B. - Kunc, J. - Paingad, Vaisakh Chelod - Kužel, Petr - Mohelský, I. - Le Mardelé, F. - Orlita, M.
Plasmon-plasmon interaction and the role of buffer in epitaxial graphene microflakes.
Physical Review B. Roč. 108, č. 4 (2023), č. článku 045308. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA MŠMT LM2023051
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : graphene * magnetoplasmon * terahertz * infrared * nanoribbons
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.108.045308

We investigate the origin of the translational symmetry breaking in epitaxially grown single-layer graphene. Despite the surface morphology of graphene films influenced by the presence of mutually parallel SiC surface terraces, the far-infrared magnetoplasmon absorption is almost independent of the angle between the probing light polarization and the orientation of terraces. We explain this discrepancy by spontaneously formed graphene microflakes. We further support our conclusions by the data from confocal Raman mapping and atomic force microscopy and also using data collected on artificially created graphene nanoribbons. An unexpectedly large plasmon resonance redshift was observed in nanoribbons. This is due to an interplay between the plasmon-plasmon coupling and the Coulomb screening by the buffer-induced interface states in nonintercalated samples featuring a buffer layer. This model determines the density of interface states in agreement with experimentally reported values.
Permanent Link: https://hdl.handle.net/11104/0349469