V. I. Belyavsky, V. V. Kapaev, Yu. V. Kopaev
Hypothetical topologically nontrivial superconducting state of two-dimensional electron system is discussed in connection with the problem of pairing with large center-of-mass pair momentum under predominant repulsive screened Coulomb interaction. Direct numerical solution of the self-consistency equation exhibits two nearly degenerate order parameters which can be formally referred to $d^{}_{x^2-y^2}$ and $d^{}_{xy}$ orbital symmetry. Spontaneous breaking of the time-reversal symmetry can mix these states and form fully gapped chiral $d+id$ superconducting state.
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http://arxiv.org/abs/1209.0884
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