2002/02/13 by M. Calandra, J. Merino, Ross H. McKenzie · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.66.195102
5 pages, 3 figures
arxiv created 2002/02/13 · arxiv updated 2009/11/30
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.