Exact ground state of the two-dimensional Hubbard model at half-filling for U=0(+)

Authors
Cini, M Stefanucci, G
Citation
M. Cini et G. Stefanucci, Exact ground state of the two-dimensional Hubbard model at half-filling for U=0(+), SOL ST COMM, 117(8), 2000, pp. 451-454
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE COMMUNICATIONS
ISSN journal
00381098 → ACNP
Volume
117
Issue
8
Year of publication
2000
Pages
451 - 454
Database
ISI
SICI code
0038-1098(2000)117:8<451:EGSOTT>2.0.ZU;2-Q
Abstract
We solve analytically the NXN square lattice Hubbard model for even N at ha lf-filling and weak coupling by a new approach. The exact ground-state wave function provides an intriguing and appealing picture of the antiferromagn etic order. Like at strong coupling, the ground state has total momentum K- tot, = (0, 0) and transforms as an s wave for even N/2 and as a d wave othe rwise. (C) 2001 Elsevier Science Ltd. All rights reserved.