APPLICATIONS OF REFLECTION POSITIVITY IN STRONGLY CORRELATED ELECTRON-SYSTEMS

Authors
SHEN SQ
Citation
Sq. Shen, APPLICATIONS OF REFLECTION POSITIVITY IN STRONGLY CORRELATED ELECTRON-SYSTEMS, Physical review. B, Condensed matter, 54(7), 1996, pp. 4397-4400
Citations number
12
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
54
Issue
7
Year of publication
1996
Pages
4397 - 4400
Database
ISI
SICI code
0163-1829(1996)54:7<4397:AORPIS>2.0.ZU;2-D
Abstract
In this paper, theorems are proved concerning the total spin and the s ign of the spin-spin correlation function for positive (semi)definite states of correlated electrons at half filling. These theorems are app lied to the ground states of the Anderson model, the Kondo model, and a generalized Hubbard model for ferromagnetism. It is found that there exists ferromagnetic or antiferromagnetic long-range order in several cases.