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.

arXiv comment5 pages, 3 figures

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• Mean-field study of charge order with long periodicity in $\theta$-(BEDT-TTF)${}_2$X
• Fermi-surface topology and the effects of intrinsic disorder in a class of charge-transfer salts containing magnetic ions, β''-(BEDT-TTF)_4[(H_3O)M(C_2O_4)_3]Y
• Dynamical properties of a strongly correlated model for quarter-filled layered organic molecular crystals
• Bandwidth tuning triggers interplay of charge order and superconductivity in two-dimensional organic materials
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• Charge, Lattice, and Spin Dynamics in Photoinduced Phase Transitions from Charge-Order-Insulator to Metal in Quasi-Two-Dimensional Organic Conductors
• Charge ordering and phase separation in the infinite dimensional extended Hubbard model
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• Domain-wall excitons and optical conductivity in one-dimensional Wigner lattices
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• Unconventional metallic conduction in two-dimensional Hubbard-Wigner lattices
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• Charge Ordered Insulator without Magnetic Order Studied by Correlator Projection Method
• CDMFT+HFD : an extension of dynamical mean field theory for nonlocal interactions applied to the single band extended Hubbard model
• Phase diagrams of half-filled 1D and 2D extended Hubbard model within COM
• Density-wave steady-state phase of dissipative ultracold fermions with nearest-neighbor interactions
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• Paramagnetic phases of strongly correlated ultracold fermions coupled to an optical cavity