Exact Solution of a Hubbard Chain with Bond-Charge Interaction

Details Exact Solution of a Hubbard Chain with Bond-Charge Interaction Exact Solution of a Hubbard Chain with Bond-Charge Interaction

1994-06-30

arxiv.org/abs/cond-mat/9406122v1

Physics

Condensed Matter

10 pages, no figures, LATEX, CNEA-CAB 3305

Scientific paper

We obtain the exact solution of a general Hubbard chain with kinetic energy $t$, bond-charge interaction $X$ and on-site interaction $U$ with the only restriction $t = X$. At zero temperature and half filling, the model exhibits a Mott transition at $U = 4t$. In the metallic phase and near half filling, superconducting states are part of the degenerate ground state and are favored for small $U$ if the system is slightly perturbed.

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