Superconducting Energy Gap in Hole-Doped Graphene Beyond the Migdal's Theory

Superconducting Properties of Graphene Doped Magnesium Diboride

Superconducting states of pure and doped graphene.

We study the superconducting phases of the two-dimensional honeycomb lattice of graphene. We find two spin singlet pairing states; s wave and an exotic p+ip that is possible because of the special structure of the honeycomb lattice. At half filling, the p+ip phase is gapless and superconductivity is a hidden order. We discuss the possibility of a superconducting state in metal coated graphene.

Anisotropy of Energy Gap in Superconducting Aluminum

Extended van Hove singularity and superconducting instability in doped graphene.

We have investigated the effects of doping on a single layer of graphene using angle-resolved photoemission spectroscopy. We show that many-body interactions severely warp the Fermi surface, leading to an extended van Hove singularity (EVHS) at the graphene M point. The ground state properties of graphene with such an EVHS are calculated, analyzing the competition between a magnetic instability...

Theory of superconducting Tc of doped fullerenes.

We develop the nonadiabatic polaron theory of superconductivity of M x C 60 taking into account the polaron band narrowing and realistic electron-phonon and Coulomb interactions. We argue that the crossover from the BCS weak-coupling superconduc-tivity to the strong-coupling polaronic and bipolaronic superconductivity occurs at the BCS coupling constant λ ∼ 1 independent of the adiabatic ratio,...