title: Triplet p-wave pairing correlation in low-doped zigzag graphene nanoribbons.
abstract: We reveal an edge spin triplet p-wave superconducting pairing correlation in slightly doped zigzag graphene nanoribbons. By employing a method that combines random-phase approximation, the finite-temperature determinant quantum Monte Carlo approach, and the ground-state constrained-path quantum Monte Carlo method, it is shown that such a spin-triplet pairing is mediated by the ferromagnetic fluctuations caused by the flat band at the edge. The spin susceptibility and effective pairing interactions at the edge strongly increase as the on-site Coulomb interaction increases, indicating the importance of electron-electron correlations. It is also found that the doping-dependent ground-state p-wave pairing correlation bears some similarity to the famous superconducting dome in the phase diagram of a high-temperature superconductor, while the spin correlation at the edge is weakened as the system is doped away from half filling.
authors.affiliation: Department of Physics, Beijing Normal University, Beijing 100875, China.|Beijing Computational Science Research Center, Beijing 100193, China.
authors.forename: Tianxing
authors.initials: T
authors.lastname: Ma
authors.affiliation: School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.affiliation: Beijing Computational Science Research Center, Beijing 100193, China.|Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China.
authors.forename: Zhongbing
authors.initials: Z
authors.lastname: Huang
authors.affiliation: Beijing Computational Science Research Center, Beijing 100193, China.
authors.forename: Hai-Qing
authors.initials: HQ
authors.lastname: Lin