“…23,24,25,26,27,28 As an example, we considered the Hubbard model on a triangular lattice, where the Fermi surface becomes disconnected into two pieces centered around the K point and the K ′ point (see Fig.1(a)) when there are a small number of holes (or electrons, depending on the sign of the hopping integral). Using fluctuation exchange (FLEX) approximation 29,30,31 and solving the linearizedÉliashberg equation, we have shown that a finite T c can be obtained for spin-triplet f -wave pairing, where the nodes of the gap run between the Fermi surfaces. 23 We have also confirmed this conclusion 32 using dynamical cluster approximation,…”