LAUSR

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 t is equal to the next nearest hoping t′, the dxy-wave pairing dominates over dx2−y2 as the electron filling 〈n〉>1.20. The dx2−y2 superconducting pairing tends to be dominated as the frustration t′∕t decreases, and the decreasing electron fillings also push the system into a possible dx2−y2 superconducting state. Our intensive nonbiased numerical results reveal the competition between dx2−y2 and dxy superconducting pairing states, clarifying the different pairing symmetries in the κ-(BEDT-TTF)2X family of organic charge transfer salts.