Phase diagrams of the one-dimensional anisotropic extended Hubbard model

摘要: We investigate global structures of ground-state phase diagrams in a one-dimensional electron system with on-site and spin-dependent nearest-neighbor-site Coulomb interactions. closely compare our numerical data for boundaries their analytical expressions limiting regions interactions, obtain good agreement between them. On the other hand, we find non-trivial intermediate-coupling region: For systems weak easy-plain anisotropy, both bond-located spin- charge-density-wave phases are realized. The latter contacts ferromagnetic stabilized strong-coupling region. When anisotropy becomes large, direct transition former is observed.