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

2016/01/22 by Elena R. Margine, Margine, E. R., Henry Lambert +3 · 3 citations
Materials Science · Physics and Astronomy · Chemistry · #Graphene research and applications #Superconductivity in MgB2 and Alloys #Fullerene Chemistry and Applications

paper · pdf · doi:10.48550/arxiv.1601.06111

Abstract

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 T_{\rm c}=6.8-8.1~K, in good agreement with experimental data. Our calculations indicate that the low-energy Ca_xy 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.

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