Marchiani Dario, Frisenda Riccardo, Mariani Carlo, Sbroscia Marco, Caruso Tommaso, De Luca Oreste, Papagno Marco, Pacilé Daniela, Jeong Samuel, Ito Yoshikazu, Betti Maria Grazia
Physics Department, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy.
Dipartimento di Fisica, Università della Calabria, Via P.Bucci, 87036 Arcavacata di Rende, Cosenza, Italy.
ACS Omega. 2024 Sep 9;9(38):39546-39553. doi: 10.1021/acsomega.4c03543. eCollection 2024 Sep 24.
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.
在此，我们提出对独立石墨烯（Gr）化学掺杂的振动响应进行全面研究。通过非弹性电子散射和芯能级光电子能谱观察到，上狄拉克锥中出现的等离子体激元激发证明了对金属性增强的补充见解。π*上狄拉克带中的电子迁移揭示了无杂质K掺杂Gr的电子 - 声子耦合，这在超高真空环境下的先进显微拉曼光谱中得到了证实。钾掺杂Gr的振动响应与注入上狄拉克锥的电荷相关，费米能级的移动揭示了显著的电子 - 声子耦合，其比栅极电压掺杂Gr中观察到的更强。
