The evolution of pairing correlation in the anisotropic triangular lattice
By using the determined quantum Monte Carlo method, we explore the evolution of the pairing correlation depending on doping and frustration in the two-dimensional Hubbard model on an anisotropic triangular lattice. In the full frustrated system where the nearest hoping term [Formula: see text] is equal to the next nearest hoping [Formula: see text], the [Formula: see text]-wave pairing dominates over [Formula: see text] as the electron filling [Formula: see text]. The [Formula: see text] superconducting pairing tends to be dominated as the frustration [Formula: see text] decreases, and the decreasing electron fillings also push the system into a possible [Formula: see text] superconducting state. Our intensive nonbiased numerical results reveal the competition between [Formula: see text] and [Formula: see text] superconducting pairing states, clarifying the different pairing symmetries in the [Formula: see text]-(BEDT-TTF)[Formula: see text] family of organic charge transfer salts.