Electron-mediated anharmonicity and its role in the Raman spectrum of graphene

Abstract

The Raman active G mode in graphene exhibits strong coupling to electrons, yet the comprehensive treatment of this interaction in the calculation of its temperature-dependent Raman spectrum remains incomplete. In this study, we calculate the temperature dependence of the G mode frequency and linewidth, and successfully explain the experimental trend, by accounting for the contributions arising from the first-order electron-phonon coupling, electron-mediated phonon-phonon coupling, and standard lattice anharmonicity. The generality of our approach enables its broad applicability to study phonon dynamics in materials where both electron-phonon coupling and anharmonicity are important.

arXiv comment15 pages, 7 figures, SI included in "anc" folder

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Cited by in corpus (1)

• Non-adiabatic phonon self-energy due to electrons with finite linewidths