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

A. Belkasri·F. D. Buzatu
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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 $\mid W/t\mid<π/\sin k^{}_F$ behaves qualitatively like the Hubbard model (t,U). Phase diagrams of the Penson-Kolb-Hubbard model (t,U,W) at various densities are presented.

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A. Belkasri, F. D. Buzatu. 1995-09-19. Ground-State Instabilities in The One-dimensional Penson-Kolb-Hubbard Model. https://doi.org/10.1103/physrevb.53.7171

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