Abstract
Using the PPP Hamiltonian model of (CH) x , we study the effects of the Coulomb interaction on the 13C-NMR of doped (CH) x and the electronic and lattice structures of polarons. The broad asymmetric 13C-NMR signal is explained by the Coulomb-induced charge density modulation around charged solitons. Polarons accompany the Coulomb-induced charge and spin density modulations which have a dip at the centre and different spreadings, the former being wider. The lattice dimerization in polarons is not only relaxed but also reversed in a central region. A polaron accompanies four midgap levels. With a suitably screened Coulomb interaction, we can get polaron and soliton levels in good agreement with the data of electrochemical doping voltage spectroscopy. The positively and negatively charged solitons make a breather-like bound state, which may explain the self-pinning of photogenerated solitons.
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