Superconductivity in graphene-lithium

We present first-principles calculations on systems consisting of a few layers of graphene and lithium. In particular, we investigate the evolution of the electron–phonon coupling strength with increasing number of layers. We find that, for intercalated systems such as C6-Li-C6 or C6-Li-C6-Li-C6, the electron–phonon coupling is weak. However, for systems of equal number of graphene and lithium layers, such as C6-Li or C6-Li-C6-Li, the electron–phonon coupling is strong. We investigate the optimal configuration that yields the highest superconducting transition temperature.