Metal-insulator transition and charge ordering in the extended Hubbard model at one-quarter filling
Abstract
We study with exact diagonalization the zero temperature properties of the quarter-filled extended Hubbard model on a square lattice. We find that increasing the ratio of the intersite Coulomb repulsion, V, to the band width drives the system from a metal to a charge ordered insulator. The evolution of the optical conductivity spectrum with increasing V is compared to the observed optical conductivity of several layered molecular crystals with the theta and beta'' crystal structures.
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