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Title:

FERROMAGNETISM IN THE HUBBARD-MODEL - INSTABILITY OF THE NAGAOKA STATE ON THE TRIANGULAR, HONEYCOMB AND KAGOME LATTICES

Document type:
Article
Author(s):
HANISCH, T; KLEINE, B; Ritzl, A; MULLERHARTMANN, E
Abstract:
In order to analyse the lattice dependence of ferromagnetism in the two-dimensional Hubbard model we investigate the instability of the fully polarised ferromagnetic ground state (Nagaoka state) on the triangular, honeycomb and kagome lattices. We mainly focus on the local instability applying single spin flip variational wave functions which include majority spin correlation effects. The question of global instability and phase separation is addressed in the framework of Hartree-Fock theory. We...     »
Journal title abbreviation:
Ann Phys -Leip
Year:
1995
Journal volume:
4
Journal issue:
4
Pages contribution:
303-328
Language:
eng
Print-ISSN:
0003-3804
TUM Institution:
Fachgebiet Neuroradiologie (Prof. Zimmer)
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