Phase diagram of the one-dimensional extended attractive Hubbard model for large nearest-neighbor repulsion

Abstract

We consider the extended Hubbard model with attractive on-site interaction U and nearest-neighbor repulsions V. We construct an effective Hamiltonian H_{eff} for hopping t<<V and arbitrary U<0. Retaining the most important terms, H_{eff} can be mapped onto two XXZ models, solved by the Bethe ansatz. The quantum phase diagram shows two Luttinger liquid phases and a region of phase separation between them. For density n<0.422 and U<-4, singlet superconducting correlations dominate at large distances. For some parameters, the results are in qualitative agreement with experiments in BaKBiO.

6 pages, 3 figures, submitted to Phys. Rev. B

References in corpus (3)

• Coupled Ladders in a Magnetic Field
• Triplet superconductivity in quasi one-dimensional systems
• Berry phases in superconducting transitions

Cited by in corpus (4)

• Quantum Phase Diagram of the t-Jz Chain Model
• Non-local quantum fluctuations and fermionic superfluidity in the imbalanced attractive Hubbard model
• Phase Separation Induced by Symmetric Monocycle Optical Pulse in Extended Hubbard Models
• Coexistence of $s$-wave superconductivity and phase separation in the half-filled extended Hubbard model with attractive interactions