Ground-State Instabilities in The One-dimensional Penson-Kolb-Hubbard Model

Abstract

Different kinds of instabilities (CDW, SDW, SS) in the 1D Hubbard model with pair-hopping interaction are investigated using an approximate Bethe-Salpeter equation. The study is performed at any density of electrons and for arbitrary values of the model parameters. In the absence of the on-site interaction, no transition occurs at half filling for any finite negative pair-hopping parameter, in agreement with recent results; our calculation suggests that the Penson-Kolb model (t,W) with $\mid W/t\mid <\pi /\sin k_F^{}$ behaves qualitatively like the Hubbard model (t,U). Phase diagrams of the Penson-Kolb-Hubbard model (t,U,W) at various densities are presented.

9 pages, Latex, 4 Figures (upon request to : [email protected])

References in corpus (3)

• A new integrable two parameter model of strongly correlated electrons in one dimension
• Thermodynamics of an integrable model for electrons with correlated hopping
• Phase Transitions in the One-Dimensional Pair-Hopping Model: a Renormalization Group Study

Cited by in corpus (3)

• Superconductivity in the Hubbard model with pair hopping
• Coexistence of $s$- and $d$-wave gaps due to pair-hopping and exchange interactions
• Alternating chain with Hubbard-type interactions: renormalization group analysis