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- W2134721976 abstract "In this paper, we study the Hubbard model with intersite Coulomb interaction in the ionic limit (i.e. no kinetic energy). It is shown that this model is isomorphic to the spin-1 Ising model in presence of a crystal field and an external magnetic field. We show that for such models it is possible to find, for any dimension, a finite complete set of eigenoperators and eigenvalues of the Hamiltonian. Then, the hierarchy of the equations of motion closes and analytical expressions for the relevant Green's functions and correlation functions can be obtained. These expressions are formal because these functions depend on a finite set of unknown parameters, and only a set of exact relations among the correlation functions can be derived. In the one-dimensional case we show that by means of algebraic constraints it is possible to obtain extra equations which close the set and allow us to obtain a complete exact solution of the model. The behavior of the relevant physical properties for the 1D system is reported." @default.
- W2134721976 created "2016-06-24" @default.
- W2134721976 creator A5005250341 @default.
- W2134721976 date "2005-10-01" @default.
- W2134721976 modified "2023-10-17" @default.
- W2134721976 title "The extended Hubbard model in the ionic limit" @default.
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- W2134721976 doi "https://doi.org/10.1140/epjb/e2005-00357-2" @default.
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