Kohn anomaly and interplay of electron-electron and electron-phonon interactions in epitaxial graphene

2008/10/22 by Shuyun Zhou, S. Y. Zhou, D. A. Siegel +5 · 3 citations
Engineering · Materials Science · Physics and Astronomy · #Advancements in Battery Materials #Boron and Carbon Nanomaterials Research #Graphene research and applications #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.78.193404

published as Phys. Rev. B 78, 193404 (2008) · accepted to Phys. Rev. B

arxiv created 2008/10/22 · openalex publication_date 2008/11/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

The interplay of electron-phonon (el-ph) and electron-electron (el-el) interactions in epitaxial graphene is studied by directly probing its electronic structure. We found a strong coupling of electrons to the soft part of the A_1g phonon evident by a kink at 150\ifmmode±\else\textpm\fi15 meV, while the coupling of electrons to another expected phonon E_2g at 195 meV can only be barely detected. The possible role of the el-el interaction to account for the enhanced coupling of electrons to the A_1g phonon, and the contribution of el-ph interaction to the linear imaginary part of the self-energy at high binding energy are also discussed. Our results reveal the dominant role of the A_1g phonon in the el-ph interaction in graphene and highlight the important interplay of el-el and el-ph interactions in the self-energy of graphene.

Citations

• Theory of Superconductivity
• Velocity Renormalization and Carrier Lifetime in Graphene from the Electron-Phonon Interaction
• Phonon Dispersion in Graphite
• Ultrathin Epitaxial Graphite: 2D Electron Gas Properties and a Route toward Graphene-based Nanoelectronics

Cited by

• Electron-electron interactions and doping dependence of the two-phonon Raman intensity in graphene
• Correlation-Driven Electron-Hole Asymmetry in Graphene Field Effect Devices
• Electron–phonon coupling in quasi-free-standing graphene