The Electron-Phonon Coupling Constant for Single-Layer Graphene on Metal Substrates Determined from He Atom Scattering

Abstract

Recent theory has demonstrated that the value of the electron-phonon coupling strength $\lambda$ can be extracted directly from the thermal attenuation (Debye-Waller factor) of Helium atom scattering reflectivity. This theory is here extended to multivalley semimetal systems and applied to the case of graphene on different metal substrates and graphite. It is shown that $\lambda$ rapidly increases for decreasing graphene-substrate binding strength. Two different calculational models are considered which produce qualitatively similar results for the dependence of $\lambda$ on binding strength. These models predict, respectively, values of ${\lambda }_{HAS}=0.89$ and 0.32 for a hypothetical flat free-standing single-layer graphene with cyclic boundary conditions. The method is suitable for analysis and characterization of not only the graphene overlayers considered here, but also other layered systems such as twisted graphene bilayers.

25 pages, 3 figures, 1 table

References in corpus (12)

• The electronic properties of graphene
• The structure of suspended graphene sheets
• Doping graphene with metal contacts
• On the roughness of single- and bi-layer graphene membranes
• Electron-phonon coupling and electron self-energy in electron-doped graphene: calculation of angular resolved photoemission spectra
• Electron-Phonon Interactions in Graphene, Bilayer Graphene, and Graphite
• p-wave triggered superconductivity in single layer graphene on an electron-doped oxide superconductor
• Understanding the origin of band gap formation in graphene on metals: graphene on Cu/Ir(111)
• Continuum approach for long-wavelength acoustic phonons in quasi-2D structures
• Origin of the Electron-Phonon Interaction of Topological Semimetal Surfaces Measured with Helium Atom Scattering
• Effect of linear density of states on the quasi-particle dynamics and small electron-phonon coupling in graphite
• Electron-Phonon Coupling Constant of Metallic Overlayers from Specular He-Atom Scattering

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