journal article·2025-04-29Open access

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

Nina Girotto Erhardt, Aloïs Castellano, J. P. Alvarinhas Batista, Raffaello Bianco, Ivor Lončarić, Matthieu J. Verstraete, Dino Novko

npj Computational Materials· Volume 11· Issue 1

Abstract

Abstract The Raman active G mode in graphene exhibits a 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.
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Research context

OpenAlex topics: Graphene research and applications · Boron and Carbon Nanomaterials Research · Diamond and Carbon-based Materials Research

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