TY - RPRT
TI - Irreducible Greens` Functions method in the theory of highly correlated systems
AB - The self-consistent theory of the correlation effects in Highly Correlated Systems (HCS) is presented. The novel Irreducible Green`s Function (IGF) method is discussed in detail for the Hubbard model and random Hubbard model. The interpolation solution for the quasiparticle spectrum, which is valid for both the atomic and band limit is obtained. The (IGF) method permits to calculate the quasiparticle spectra of many-particle systems with the complicated spectra and strong interaction in a very natural and compact way. The essence of the method deeply related to the notion of the Generalized Mean Fields (GMF), which determine the elastic scattering corrections. The inelastic scattering corrections leads to the damping of the quasiparticles and are the main topic of the present consideration. The calculation of the damping has been done in a self-consistent way for both limits. For the random Hubbard model the weak coupling case has been considered and the self-energy operator has been calculated using the combination of the IGF method and Coherent Potential Approximation (CPA). The other applications of the method to the s-f model, Anderson model, Heisenberg antiferromagnet, electron-phonon interaction models and quasiparticle tunneling are discussed briefly. (author). 79 refs.
AU - Kuzemsky, A L
KW - 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
KW - HUBBARD MODEL
KW - DYSON REPRESENTATION
KW - ELECTRON CORRELATION
KW - BAND THEORY
KW - ELECTRONIC STRUCTURE
KW - GREEN FUNCTION
KW - INTERPOLATION
KW - IRREDUCIBLE REPRESENTATIONS
KW - MEAN-FIELD THEORY
KW - 665400
KW - QUANTUM PHYSICS ASPECTS OF CONDENSED MATTER
DO -
UR -
PB -
CY - IAEA
PY - 1994
DA - 1994-09-01
LA - English
J2 -
C1 - International Centre for Theoretical Physics (ICTP), Trieste (Italy)
C2 -
ER -