Exact results on ferromagnetism in correlated electron systems
Journal Article
·
· Journal of Low Temperature Physics
- Institut fuer Theoretische, Aachen (Germany)
Exact results, both old and new, on the stability of saturated ferromagnetism in the Hubbard model and its extension are discussed. For the Hubbard model with all nearest-neighbor interactions a new set of rigorous criteria, valid at half filling, is derived and a generalization of Nagaoka`s theorem to finite interactions is presented. Of all coupling parameters only the on-site and the exchange interaction are found to be essential. At strong coupling comparison with the effective t-J model is made. Further extensions, e.g. to the band-degenerate case, are discussed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 107620
- Report Number(s):
- CONF-9409365--
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 99; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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