Condensed Matter Physics, 2006, vol. 9, No. 3(47), p. 535544, English
DOI:10.5488/CMP.9.3.535
Title:
Evolution of the spectrum of the
Hubbard model with filling
Author(s):
 A.Sherman
(Institute of Physics, University of Tartu, Riia 142, 51014 Tartu,
Estonia)

Nonequilibrium properties of an inhomogeneous electron gas are
studied using the method of the nonequilibrium statistical
operator by D.N. Zubarev. Generalized transport equations for the
mean values of inhomogeneous operators of the electron number
density, momentum density, and total energy density for weakly and
strongly nonequilibrium states are obtained. We derive a chain of
equations for the Green's functions, which connects commutative
timedependent Green's functions "densitydensity",
"momentummomentum", "enthalpyenthalpy" with reduced Green's
functions of the generalized transport coefficients and with
Green's functions for higher order memory kernels in the case of a
weakly nonequilibrium spatially inhomogeneous electron gas.
Key words:
Hubbard model, diagram technique, energy spectrum
PACS:
71.10.Fd, 71.10.w
