Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-02-28
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 11 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.72.045134
An approximate analytical scheme of the dynamical mean field theory (DMFT) is developed for the description of the electron (ion) lattice systems with Hubbard correlations within the asymmetric Hubbard model where the chemical potentials and electron transfer parameters depend on an electron spin (a sort of ions). Considering a complexity of the problem we test the approximation in the limiting case of the infinite-$U$ spinless Falicov-Kimball model. Despite the fact that the Falicov-Kimball model can be solved exactly within DMFT, the densities of states of localized particles have not been completely investigated off half filling. We use the approximation to obtain the spectra of localized particles for various particle concentrations (chemical potentials) and temperatures. The effect of a phase separation phenomenon on the spectral function is considered.
Hera Orest B.
Stasyuk Ihor V.
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