Abstract
We study possible occurrence of spin-triplet superconductivity in the model of two Hubbard chains coupled with ferromagnetic exchange interaction. We use the analytical bozonization method as well as the numerical exact-diagonalization and density-matrix renormalization group methods. We show that, in the low electron density region, the complete ferromagnetic state occurs and the triplet pairing correlation is most dominant, where we find that the gap function behavior is p y -wave like. We also show that, in the high electron density regions, the spin-singlet superconductivity anticipated by the weak coupling analysis is most dominant, where the gap function behavior is d xy -wave like.
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