2-SITE HUBBARD-MODEL, THE BARDEEN-COOPER-SCHRIEFFER MODEL, AND THE CONCEPT OF CORRELATION ENTROPY

Authors
ZIESCHE P GUNNARSSON O JOHN W BECK H
Citation
P. Ziesche et al., 2-SITE HUBBARD-MODEL, THE BARDEEN-COOPER-SCHRIEFFER MODEL, AND THE CONCEPT OF CORRELATION ENTROPY, Physical review. B, Condensed matter, 55(16), 1997, pp. 10270-10277
Citations number
29
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
55
Issue
16
Year of publication
1997
Pages
10270 - 10277
Database
ISI
SICI code
0163-1829(1997)55:16<10270:2HTBMA>2.0.ZU;2-J
Abstract
Exactly solvable models (the two-electron two-site Hubbard model and t he Bardeen-Cooper-Schrieffer model) are revisited in terms of their na tural occupation numbers (eigenvalues of the true, i.e., correlated, o ne-particle density matrix). Entropylike expressions that may serve as measures of the correlation strength are related to possible referenc e states for the definition of correlation and discussed as functions of the system parameters.