Electron correlation in the charge-density wave state of MX complexes

Abstract

The effect of the electmn-elecnon (e-e) interaction on the charge-density wave (cow) of MX complexes is studied using the Cutzwiller variational method within the one-band model, and neglecting the quantum features of the lattice. It is found thal the effect of the e-e intemction on the m w in MX complexes is opposite to that on the BOW (bondader wave) in the conjugated polymer, although both the CDW and BOW have the same origin, which is the dimerization of the one-dimensional lanice. The CDW is suppressed by the ee interaction, and the BOW is initially enhanced. The physical reason for this c o n a t is analysed.