Metal-insulator transition of fermions on a kagome lattice at 1/3 filling.
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.
Nishimoto
Satoshi
S
IFW Dresden, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, D-01171 Dresden, Germany.
Nakamura
Masaaki
M
O'Brien
Aroon
A
Fulde
Peter
P