Naslov
Raman features of graphene beyond the standard nonadiabatic theory

Autori
Girotto, Nina ; Novko, Dino

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
DPG-Frühjahrstagung (DPG Spring Meeting) of the Condensed Matter Section (SKM)

Mjesto i datum
Dresden, Njemačka, 26.03.2023. - 31.03.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
phonon, electron-phonon interaction, DFT, nonadiabaticity, graphene, Raman
(graphene, Raman, phonon, electron-phonon interaction, DFT, nonadiabaticity)

Sažetak
Although graphene has already been thoroughly studied with Raman spectroscopy, there still exists a disagreement about the broadening mechanisms of the E2g mode and its actual temperature dependence [Nano Lett. 10, 466 (2010)]. Along with the importance of the nonadiabatic effects in graphene, higher order electron-phonon scattering processes also significantly impact the phonon spectrum. Specifically, the electron-phonon-induced lifetime and energy renormalization of the electron-hole pair excitations bring additional temperature dependence in the electron-coupled phonon modes and their corresponding linewidths. The nonadiabatic theory relying on first principles calculations, developed in [Phys. Rev. B 98, 041112(R) (2018)], is here successfully applied to graphene in various doping regimes.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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