Abstract
To study the metal–insulator (MI) transition of Bechgaad salts, we investigate the one-dimensional (1D) dimerized Hubbard model with the nearest-neighbor Coulomb repulsions at quarter-filling. Density-matrix renormalization group (DMRG) technique is used to obtain the charge gap of this model. Thus, we examine the effect of the nearest-neighbor repulsion on the charge gap. We also investigate the simplified model of quasi-1D organic systems, using the weak-coupling theory and mean-field approximation, and then propose a possible idea for the MI transition.
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