Possible triplet p + i p superconductivity in graphene at low filling

@article{Ma2014PossibleTP,
  title={Possible triplet p + i p superconductivity in graphene at low filling},
  author={Tianxing Ma and Fan Yang and Hong Yao and Hai-Qing Lin},
  journal={Physical Review B},
  year={2014},
  volume={90},
  pages={245114}
}
We study the Hubbard model on the honeycomb lattice with nearest-neighbor hopping ($t>0$) and next-nearest-neighbor one ($t'<0$). When $t'<-t/6$, the single-particle spectrum is featured by the continuously distributed Van-Hove saddle points at the band bottom, where the density of states diverges in power-law. We investigate possible unconventional superconductivity in such system with Fermi level close to the band bottom by employing both random phase approximation and determinant quantum… 
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