Superconductivity in a model of two Hubbard chains coupled with ferromagnetic exchange interaction

Abstract

We study the ground-state properties of the double-chain Hubbard model coupled with ferromagnetic exchange interaction by using the weak-coupling theory, density-matrix renormalization group technique, and Lanczos exact-diagonalization method. We determine the ground-state phase diagram in the parameter space of the ferromagnetic exchange interaction and band filling. We find that, in high electron density regime, the spin gap opens and the spin-singlet $d_{xy}$-wave-like pairing correlation is most dominant, whereas in low electron density regime, the fully-polarized ferromagnetic state is stabilized where the spin-triplet $p_y$-wave-like pairing correlation is most dominant.

11 pages, 10 figures

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• Luther-Emery liquid and dominant singlet superconductivity in the hole-doped Haldane spin-1 chain
• One-dimensional physics in transition-metal nanowires: Phases and elementary excitations