LOCALIZATION IN THE INTERACTING-RANDOM-DIMER MODEL

We study the effects of electron-electron interactions on the localiza tion properties of electronic states in the random-dimer model. We sho w at the mean-field level that, although disorder or interactions sepa rately do not destroy the dimer resonances, the combination of both ca n lead to localization. However, numerical evidence suggests that the localization length of the electronic states is larger than the typica l size of the polymers in which this model is relevant.