Symmetry classification of mean field solutions for eg Hubbard model on a triangular lattice Original Research Article

This paper describes a group theoretical classification of mean field solutions of eg 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=(τx,τy,τz). The states in which the orbital ordering and the charge (spin) density wave ordering coexist are also possible.