Possible triplet p+ip superconductivity in graphene at low filling
Tianxing Ma, Fan Yang, Hong Yao, Hai-Qing Lin
DOI 10.1103/PhysRevB.90.245114 · Physical Review B
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Abstract
We study the Hubbard model on the honeycomb lattice with nearest-neighbor hopping (t>0) and next-nearest-neighbor hopping (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 a power law. We investigate possible unconventional superconductivity in such systems with the Fermi level close to the band bottom by employing both random-phase-approximation and determinant quantum Monte Carlo approaches. Our study reveals a possible triplet p+ip superconductivity in this system with appropriate interactions. Our results might provide a possible route to look for triplet superconductivity with relatively high transition temperature in low-filled graphene and other similar systems.
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