Charge Effects and Electron Phonon Coupling in Potassium-Doped Graphene
Herewith, we propose a comprehensive study of the vibrational response of chemical doping of free-standing graphene (Gr). Complementary insights on the increased metallicity have been demonstrated by the emerging plasmon excitation in the upper Dirac cone, observed by inelastic electron scattering and core-level photoemission. The electron migration in the π* upper Dirac band unveils an electron-phonon coupling of contaminant-free K-doped Gr, as evidenced by advanced micro-Raman spectroscopy in ultrahigh vacuum ambient. The vibrational response of potassium-doped Gr correlated with the charge injected in the upper Dirac cone, and the Fermi level shift unravel a notable electron-phonon coupling, which is stronger than that observed for gate voltage-doped Gr.
Authors
- D. Pacilè (ORCID: https://orcid.org/0000-0001-6219-3889)
- T. Caruso (ORCID: https://orcid.org/0000-0003-4940-552X)
- Oreste De Luca (ORCID: https://orcid.org/0000-0002-4428-0863)
- Carlo Mariani (ORCID: https://orcid.org/0000-0002-7979-1700)
- Yoshikazu Ito (ORCID: https://orcid.org/0000-0001-8059-8396)
- Marco Sbroscia (ORCID: https://orcid.org/0000-0003-4814-6714)
- Samuel Jeong (ORCID: https://orcid.org/0000-0003-2231-7271)
- Riccardo Frisenda (ORCID: https://orcid.org/0000-0003-1728-7354)
- M. Papagno (ORCID: https://orcid.org/0000-0003-2623-1563)
- Maria Grazia Betti (ORCID: https://orcid.org/0000-0002-6244-0306)
- Dario Marchiani (ORCID: https://orcid.org/0000-0003-4508-0756)
Institutions
- University of Tsukuba (JP)
- University of Calabria (IT)
- Sapienza University of Rome (IT)
Publication Details
- Journal
- ACS Omega
- Published
- 2024-09-09
- DOI
- https://doi.org/10.1021/acsomega.4c03543
- Citations
- 2
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.23
Funders
- European Commission
- Sapienza Università di Roma
- Casio Science Promotion Foundation
- Ministero dell'Università e della Ricerca
- Japan Society for the Promotion of Science