Crossover from Quarter-Filling to Half-Filling in a One-Dimensional Electron System with a Dimerized and Quarter-Filled Band

Abstract

The interplay between quarter-filled and half-filled umklapp scattering has\nbeen examined by applying the renormalization group method to a one-dimensional\nquarter-filled electron system with dimerization, on-site (U) and\nnearest-neighbor (V) repulsive interactions. The phase diagram on the U-V plane\nis obtained at absolute zero temperature where the Mott insulator (the charge\nordered insulator) is found for smaller (larger) V. By choosing the moderate\nparameter in the region of Mott insulator, it is shown that the resistivity\nexhibits a crossover from behavior of quarter-filling to that of half-filling\nwith decreasing temperature.\n