Title of article :
The Kohn–Luttinger superconductivity in idealized doped graphene
Author/Authors :
Kagan، نويسنده , , M.Yu. and Val?kov، نويسنده , , V.V. and Mitskan، نويسنده , , V.A. and Korovushkin، نويسنده , , M.M.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
6
From page :
61
To page :
66
Abstract :
Idealized graphene monolayer is considered neglecting the van der Waals potential of the substrate and the role of the nonmagnetic impurities. The effect of the long-range Coulomb repulsion in an ensemble of Dirac fermions on the formation of the superconducting pairing in a monolayer is studied in the framework of the Kohn–Luttinger mechanism. The electronic structure of graphene is described in the strong coupling Wannier representation on the hexagonal lattice. We use the Shubin–Vonsowsky model which takes into account the intra- and intersite Coulomb repulsions of electrons. The Cooper instability is established by solving the Bethe–Salpeter integral equation, in which the role of the effective interaction is played by the renormalized scattering amplitude. The renormalized amplitude contains the Kohn–Luttinger polarization contributions up to and including the second-order terms in the Coulomb repulsion. We construct the superconductive phase diagram for the idealized graphene monolayer and show that the Kohn–Luttinger renormalizations and the intersite Coulomb repulsion significantly affect the interplay between the superconducting phases with f -, d + id -, and p + ip -wave symmetries of the order parameter.
Keywords :
A. Graphene , D. Superconductivity
Journal title :
Solid State Communications
Serial Year :
2014
Journal title :
Solid State Communications
Record number :
1751655
Link To Document :
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