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

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  • Tsuchiizu Masahisa
    Department of Physics, Nagoya University, Nagoya 464-8602
  • Yoshioka Hideo
    Department of Physics, Nara Women's University, Nara 630-8506
  • Suzumura Yoshikazu
    Department of Physics, Nagoya University, Nagoya 464-8602 CREST, Japan Science of Technology Corporation (JST)

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

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