Electric field-induced chirald plus idsuperconductivity in AA-stacked bilayer graphene: a quantum Monte Carlo study

Using the constrained-path quantum Monte Carlo method, we systematically study the half-filled Hubbard model on AA-stacked honeycomb lattice. Our simulations demonstrate that a dominant chirald+idwave superconductivity can be induced by a perpendicular electric field. At a fixed electric field, the effective pairing interaction of chirald+idsuperconductivity exhibits an increasing behavior with increasing the on-site Coulomb interaction. We attribute the electric field-inducedd+idsuperconductivity to an increased density of states near the Fermi energy and robust antiferromagnetic spin correlation upon turning on electric field. Our results strongly suggest that the AA-stacked graphene system is a good candidate for chirald+idsuperconductor.