Superconducting states of pure and doped graphene

Phys Rev Lett. 2007 Apr 6;98(14):146801. doi: 10.1103/PhysRevLett.98.146801. Epub 2007 Apr 3.


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.