Title: Pseudospin-electron model spectrum in alloy analogy approximation
Author(s):

	I.V.Stasyuk (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine) ,
	V.O.Krasnov (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine)

Energy spectrum of the pseudospin-electron model is investigated in the alloy analogy approximation within the framework of the dynamical mean field theory (DMFT). The case of two near Hubbard-like electron subbands, which determine the location of chemical potential at a certain set of model parameter values, is considered. The conditions of gap appearance in the spectrum are established. The effect of the asymmetry field h and tunneling-like splitting of levels in the local anharmonic well on the critical value U_crit of the on-site Hubbard interaction constant is investigated.

Key words: dynamical mean-filed theory, irreducible Green's functions, pseudospin-electron model, alloy analogy approximation
PACS: 71.10.Fd, 71.38.+i