title: Metal-insulator transition of fermions on a kagome lattice at 1/3 filling.
abstract: We discuss the metal-insulator transition of the spinless fermion model on a kagome lattice at 1/3 filling. The system is analyzed by using exact diagonalization, density-matrix renormalization group methods, and random-phase approximation. In the strong-coupling region, the charge-ordered ground state is consistent with the predictions of an effective model, i.e., plaquette order. We find that the qualitative properties of the metal-insulator transition are totally different depending on the sign of the hopping matrix elements, reflecting the difference in the band structure near the Fermi level.
authors.affiliation: IFW Dresden, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, D-01171 Dresden, Germany.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nishimoto
authors.forename: Masaaki
authors.initials: M
authors.lastname: Nakamura
authors.forename: Aroon
authors.initials: A
authors.lastname: O'Brien
authors.forename: Peter
authors.initials: P
authors.lastname: Fulde