Abstract
We investigate a one-band model with electron-libron coupling and a steric potential in order to discuss the influence of phenyl-ring rotations on the electronic properties of pernigraniline, the fully oxidized form of polyaniline. The T = 0-ground-state phase diagram is mapped out, and it is shown that forward-scattering processes of electrons play an important role in the framework of this model. They lead to the possibility of a charge-separation ground-state. Adding a local Hubbard repulsion, we find a strong dimerization enhancement for weak U while in the large- U limit the Peierls ground-state can break down in a certain region of parameter space.
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