Electron-phonon interaction and pairing mechanism in superconducting Ca-intercalated bilayer graphene.

ABSTRACT: Using the 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.

SUBMITTER: Margine ER 

PROVIDER: S-EPMC4759825 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature