Condensed Matter Physics, 2006, vol. 9, No. 4(48), p. 725740, English
DOI:10.5488/CMP.9.4.725
Title:
Pseudospinelectron 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 pseudospinelectron model is investigated
in the alloy analogy approximation within the framework of the
dynamical mean field theory (DMFT). The case of two near
Hubbardlike 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
tunnelinglike splitting of levels in the local anharmonic well on
the critical value U_{crit} of the
onsite Hubbard interaction constant is investigated.
Key words:
dynamical meanfiled theory, irreducible Green's
functions, pseudospinelectron model, alloy analogy approximation
PACS:
71.10.Fd, 71.38.+i
