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Titel:

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

Dokumenttyp:
Article
Autor(en):
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...     »
Zeitschriftentitel:
Ann Phys -Leip
Jahr:
1995
Band / Volume:
4
Heft / Issue:
4
Seitenangaben Beitrag:
303-328
Sprache:
eng
Print-ISSN:
0003-3804
TUM Einrichtung:
Fachgebiet Neuroradiologie (Prof. Zimmer)
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