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 bandwidth drives the system from a metal to a charge ordered insulator. The evolution of the optical conductivity spectrum with increasing V is in agreement with the observed optical conductivity of several layered molecular crystals with the (formula presented) and (formula presented) crystal structures. © 2002 The American Physical Society.
Metal-insulator transition and charge ordering in the extended Hubbard model at one-quarter filling / Calandra, M.; Merino, J.; Mckenzie, R. H.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 66:19(2002), pp. 1-5. [10.1103/PhysRevB.66.195102]
Metal-insulator transition and charge ordering in the extended Hubbard model at one-quarter filling
Calandra M.;
2002-01-01
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 bandwidth drives the system from a metal to a charge ordered insulator. The evolution of the optical conductivity spectrum with increasing V is in agreement with the observed optical conductivity of several layered molecular crystals with the (formula presented) and (formula presented) crystal structures. © 2002 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
