Fulde-Ferrell-Larkin-Ovchinnikov oscillations and magnetic domains in the Hubbard model with off-diagonal Coulomb repulsion

We observe the effect of non-zero magnetization m on the superconducting ground state of the one-dimensional Hubbard model with off-diagonal Coulomb repulsion X. For t/2 ? X ? 2t/3, the system first manifests Fulde-Ferrell-Larkin-Ovchinnikov oscillations in the pair-pair correlations. For m = m 1 a kinetic energy driven macroscopic phase separation into low density superconducting domains and high density polarized walls takes place. For m > m 2 the domains fully localize, and the system eventually becomes a ferrimagnetic insulator. © 2011 IOP Publishing Ltd and SISSA.