A generating functional approach to the sd-model with strong correlations

Condensed Matter Physics

关键词: theories and models of many-electron systems;    lattice fermion models;    strongly correlated electron systems;   

DOI  :  10.5488/CMP.8.4.801

来源: DOAJ

【 摘 要 】

A Kadanoff-Baym-type generating functional approach, earlier developed by the authors to strongly correlated systems, is applied to the sd-model with strong sd-coupling. Formalism of the Hubbard X-operators was used, and equation for electron Green's function was derived with functional derivatives over external fluctuating fields. Iterations in this equation generate a perturbation theory near the atomic limit. Hartree-Fock type approximation is developed within the framework of this theory, and the problem of a metal-insulator phase transition in sd-model is discussed.

【 授权许可】

Unknown