Correlation Effects in a One-Dimensional Quarter-Filled Electron System with Repulsive Interactions.

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  • Yoshioka Hideo
    Department of Physics, Nagoya University, Nagoya 464–8602
  • Tsuchiizu Masahisa
    Department of Physics, Nagoya University, Nagoya 464–8602
  • Suzumura Yoshikazu
    Department of Physics, Nagoya University, Nagoya 464–8602 CREST, Japan Science and Technology Corporation (JST)

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Abstract

A one-dimensional electron system at quarter-filling has been examined by applying the renormalization group method to a bosonized model with on-site (U) and nearest-neighbor (V) repulsive interactions. By evaluating both normal scattering and Umklapp scattering perturbatively, we obtain a phase diagram in which a metallic state with a 2kF spin density wave (kF is the Fermi wave number) moves into an insulating state with charge disproportionation of a 4kF charge density wave with an increase in both U and V. The effect of the next-nearest-neighbor repulsion is also discussed.

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