Abstract

Electron interaction effects on the ground state and lowest electronic excitations of the (AB) x polymer are studied. It is shown that electron-electron interactions can affect the charge-density wave changing the effective site energy alternation. The absolute Coulomb corrections to kink energies depend on the occupation of local levels. Polarons can decay into kink-antikink pairs in the region where no fragmentation would occur in the absence of Coulomb interaction. Two added charges, as well, can be accomodated in the form of four kinks. Which soliton pairs (spinless or magnetic) correspond to the defects in the ground state and which can be photoexcited are determined by the interplay of the system parameters.

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