ON A SIMPLE CEPA LIKE APPROACH TO ELECTRON CORRELATIONS IN D-DIMENSIONAL HUBBARD-MODEL CLUSTERS

Authors
Citation
K. Rosciszewski, ON A SIMPLE CEPA LIKE APPROACH TO ELECTRON CORRELATIONS IN D-DIMENSIONAL HUBBARD-MODEL CLUSTERS, ACT PHY P B, 28(9), 1997, pp. 2049-2055
Citations number
10
Categorie Soggetti
Physics
Journal title
ACTA PHYSICA POLONICA B
ISSN journal
05874254 → ACNP
Volume
28
Issue
9
Year of publication
1997
Pages
2049 - 2055
Database
ISI
SICI code
0587-4254(1997)28:9<2049:OASCLA>2.0.ZU;2-1
Abstract
In this short note a simple quantum chemical type of approach to elect ron correlations in d-dimensional Hubbard model is proposed. In essenc e, the method is very closely related to CEPA-0 approximation (also to Gutzwiller approximation and to the Local ansatz) and as such is no n ovelty. The real aim is to provide unsophisticated and computationally cheap method which allows for an easy treatment of electron correlati ons in finite cluster models with a simple Hubbard type Hamiltonians.