Phys. Rev. Lett. 100, 246808 (2008) [4 pages]BCS Superconductivity of Dirac Electrons in Graphene LayersReceived 27 March 2008; published 20 June 2008 Possible superconductivity of electrons with the Dirac spectrum is analyzed using the BCS model. We calculate the critical temperature, the superconducting energy gap, and the supercurrent as functions of the doping level and of the pairing interaction strength. Zero doping is characterized by the existence of a quantum critical point such that the critical temperature vanishes below some finite value of the interaction strength. However, the critical temperature remains finite for any nonzero electron or hole doping level when the Fermi energy is shifted away from the Dirac point. As distinct from usual superconductors, the supercurrent density is not proportional to the number of electrons but is strongly decreased due to the presence of the Dirac point. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.246808
DOI:
10.1103/PhysRevLett.100.246808
PACS:
73.63.−b, 74.25.Jb, 74.78.Na
See AlsoComment: Bruno Uchoa and A. H. Neto, Comment on “BCS Superconductivity of Dirac Electrons in Graphene Layers”, Phys. Rev. Lett. 102, 109701 (2009). Reply: N. B. Kopnin and E. B. Sonin, Kopnin and Sonin Reply:, Phys. Rev. Lett. 102, 109702 (2009). |
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