Abstract
This paper describes a group theoretical classification of mean field solutions of e g Hubbard model on a two-dimensional triangular lattice. Only the point K in the first Brillouin zone is considered as an ordering vector. In total 13 broken symmetry states are obtained, and among them eight states are magnetic and five states non-magnetic. The orbital ordered states are well characterized in terms of the pseudo-spin τ=( τ x , τ y , τ z ). The states in which the orbital ordering and the charge (spin) density wave ordering coexist are also possible.
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