2001/06/30 by A. M. Shvaika
Physics and Astronomy · #cond-mat.str-el
published as Acta Physica Polonica B 32, 3415 (2001) · 6 pages, published in the Proceedings the XII-th School on Phase Transitions and Critical Phenomena, 21-24 June, 2001, Ladek Zdroj, Poland
arxiv created 2001/11/12 · arxiv updated 2009/11/30
In the limit of infinite spatial dimensions a thermodynamically consistent theory of the strongly correlated electron systems, which is valid for arbitrary value of the Coulombic interaction (U<∞), is built. For the Hubbard model the total auxiliary single-site problem exactly splits into four subspaces, which describe Fermi and non-Fermi liquid components. Such analytical approach allows to construct different thermodynamically consistent approximations: alloy-analogy approximation, Hartree-Fock approximation and further, that describes the self-consistent renormalization of the bosonic excitations (magnons and doublons).