UPPER-BOUNDS TO THE SPIN GAP FOR QUANTUM SPIN-1 2 SYSTEMS FROM COUPLED CHAINS TO SQUARE LATTICE/

Authors
SONG Z
Citation
Z. Song, UPPER-BOUNDS TO THE SPIN GAP FOR QUANTUM SPIN-1 2 SYSTEMS FROM COUPLED CHAINS TO SQUARE LATTICE/, Physics letters. A, 233(1-2), 1997, pp. 135-138
Citations number
7
Categorie Soggetti
Physics
Journal title
Physics letters. A → ACNP
ISSN journal
03759601
Volume
233
Issue
1-2
Year of publication
1997
Pages
135 - 138
Database
ISI
SICI code
0375-9601(1997)233:1-2<135:UTTSGF>2.0.ZU;2-C
Abstract
The spin-1/2 antiferromagnetic Heisenberg model on an L x n(c) (n(c) i s even) lattice with periodic boundary conditions is studied in the fr amework of a variational approach. It is shown that the upper bounds o f the spin gap of the ladders with any width n(c) decrease as (4n(c) - 2)/n(c)(2). (C) 1997 Elsevier Science B.V.