COUPLED-CLUSTER APPROXIMATION IN MOMENTUM-SPACE

Authors
CORNU F JOLICOEUR T LEGUILLOU JC
Citation
F. Cornu et al., COUPLED-CLUSTER APPROXIMATION IN MOMENTUM-SPACE, Physical review. B, Condensed matter, 49(14), 1994, pp. 9548-9554
Citations number
15
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
49
Issue
14
Year of publication
1994
Pages
9548 - 9554
Database
ISI
SICI code
0163-1829(1994)49:14<9548:CAIM>2.0.ZU;2-H
Abstract
A simple coupled-cluster-type approximation is introduced, which gener alizes in momentum (k) space a method recently presented in the litera ture for real space, and tested on the exactly solvable XXZ anisotropi c quantum antiferromagnetic spin-1/2 chain. We implement our approxima tion in k space on the fermionized version of this model, and obtain i mproved results, with remarkable quantitative and qualitative features .