摘要
We have considered the effects of Hubbard repulsion on the charge-density-wave(CDW)state of halogen-bridged mixed-valence transition metal complex(MX complex)within mean field theory(MFT),and taken electron correlation into account by second-order perturbation relative to the mean field state.It is seen correlation reduces the dimerization and narrows the band gap further compared with MFT.
基金
the National Natural Science Foundation of China.
