Asymmetric Hubbard model within generating functional approach in dynamical mean field theory
In the paper a new analytic approach to the solution of the effective single-site problem in the dynamical mean field theory is developed. The approach is based on the method of the Kadanoff-Baym generating functional in the form developed by Izyumov et al. It makes it possible to obtain a close...
Gespeichert in:
| Datum: | 2006 |
|---|---|
| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Інститут фізики конденсованих систем НАН України
2006
|
| Schriftenreihe: | Condensed Matter Physics |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/121365 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Asymmetric Hubbard model within generating functional approach in dynamical mean field theory / I.V. Stasyuk, O.B. Hera // Condensed Matter Physics. — 2006. — Т. 9, № 3(47). — С. 587–602. — Бібліогр.: 40 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | In the paper a new analytic approach to the solution of the effective single-site problem in the dynamical mean
field theory is developed. The approach is based on the method of the Kadanoff-Baym generating functional in
the form developed by Izyumov et al. It makes it possible to obtain a closed equation in functional derivatives
for the irreducible part of the single-site particle Green’s function; the solution is constructed iteratively. As
an application of the proposed approach the asymmetric Hubbard model (AHM) is considered. The inverse
irreducible part Ξ⁻¹σ of the single-site Green’s function is constructed in the linear approximation with respect
to the coherent potential Jσ. Basing on the obtained result, the Green’s function of itinerant particles in the
Falicov-Kimball limit of AHM is considered, and the decoupling schemes in the equations of motion approach
(GH3 approximation, decoupling by Jeschke and Kotliar) are analysed. |
|---|