EQUIVALENCE IN SPIN-WAVE THEORIES

Authors
ITOI C KATO M
Citation
C. Itoi et M. Kato, EQUIVALENCE IN SPIN-WAVE THEORIES, Journal of physics. A, mathematical and general, 27(8), 1994, pp. 2915-2922
Citations number
11
Categorie Soggetti
Physics
Journal title
Journal of physics. A, mathematical and general → ACNP
ISSN journal
03054470
Volume
27
Issue
8
Year of publication
1994
Pages
2915 - 2922
Database
ISI
SICI code
0305-4470(1994)27:8<2915:EIST>2.0.ZU;2-W
Abstract
Equivalence in spin wave theories is pointed out from the viewpoint of gauge invariance. Both the Holstein-Primakoff and the Dyson-Maleev re presentations are derived by imposing certain gauge fixing conditions on the Schwinger formalism which is gauge invariant. We show explicitl y the equality of partition functions of the Heisenberg model calculat ed in the Holstein-Primakoff and the Dyson-Maleev representations in h igh-temperature expansion.