Using the {\it ab initio} anisotropic Eliashberg theory including Coulomb interactions, we investigate the electron-phonon interaction and the pairing mechanism in the recently-reported superconducting Ca-intercalated bilayer graphene. We find that C6CaC6 can support phonon-mediated superconductivity with a critical temperature Tc=6.8-8.1~K, in good agreement with experimental data. Our calculations indicate that the low-energy Caxy vibrations are critical to the pairing, and that it should be possible to resolve two distinct superconducting gaps on the electron and hole Fermi surface pockets.
@article{arxiv.1601.06111,
title = {Electron-phonon interaction and pairing mechanism in superconducting Ca-intercalated bilayer graphene},
author = {E. R. Margine and Henry Lambert and Feliciano Giustino},
journal= {arXiv preprint arXiv:1601.06111},
year = {2016}
}