The electron–phonon coupling constant for single-layer graphene on metal substrates determined from He atom scattering

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