Naslov
Finding the bare band: Electron coupling to two phonon modes in potassium-doped graphene on Ir(111)

Autori
Pletikosić, Ivo ; Kralj, Marko ; Milun, Milorad ; Pervan, Petar

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 85 (2012); 155447-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
graphene; iridium; angle-resolved photoelectron spectroscopy; electron-phonon coupling

Sažetak
We analyze renormalization of the π* band of n- doped epitaxial graphene on Ir(111) induced by electron-phonon coupling. Our procedure of extracting the bare band relies on recursive self- consistent refining of the functional form of the bare band until the convergence. We demonstrate that the components of the self-energy, as well as the spectral intensity obtained from angle- resolved photoelectron spectroscopy, show that the renormalization is due to the coupling to two distinct phonon excitations. From the velocity renormalization and an increase of the imaginary part of the self-energy we find the electron- phonon coupling constant to be ∼0.2, which is in fair agreement with a previous study of the same system, despite the notable difference in the width of spectroscopic curves. Our experimental results also suggest that potassium intercalated between graphene and Ir(111) does not introduce any additional increase of the quasiparticle scattering rate.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA