上海科技大学知识管理系统

Recent ARPES experiments on doped 1D cuprates revealed the importance of effective near-neighb or (NN) attractions in explaining certain features in spectral functions. Here we investigate spectral properties of the extended Hubbard model with the on-site repulsion U and NN interaction V, by employing bosonization analysis and the high-precision time-dependent variational principle (TDVP) calculations of the model on 1D chain with up to 300 sites. From state-of-the-art TDVP cal-culations, we find that the spectral weights of the holon-folding and 3kF branches evolve oppositely as a function of V. This peculiar dichotomy may be explained in bosonization analysis from the opposite dependence of exponent that determines the spectral weights on Luttinger parameter Kρ. Moreover, our TDVP calculations of models with fixed U = 8t and different V show that V −1.7t may fit the experimental results best, indicating a moderate effective NN attraction in 1D cuprates that might provide some hints towards understanding superconductivity in 2D cuprates.