Influence of Strong Electron-Electron Interaction on the Peierls Transition

The influence of short-ranged Coulomb repulsion of strongly correlated electrons on the Peierls transition for a quasi-one-dimensional system is investigated. It shows that the influence varies with the band filling and proves that the condition of single-occupation leads to a singularity on the density of states at half-filling which enhances dimerization. It also shows that dimerization is suppressed by the increase of U in the region of large-U and proves that increasing nearest-neighbor interaction V will suppress the Peierls transition temperature at half-filling, and strongly enhance it for band-filling at n ≈ 1/4, which means the enhancement of tetramer-ization for a quarter-filled band.