Near resonant scattering from nonsymmetric dimers: Applications to substituted polyanilines

• Autor(a) principal: Lavarda, F. C. [UNESP]
• Data de Publicação: 1994
• Outros Autores: Dos Santos, M. C., Galv, D. S., Laks, B.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevLett.73.1267; http://hdl.handle.net/11449/225125

In this work we show that, beyond the prediction of the random dimer model [Wu and Phillips, Phys. Rev. Lett. 66, 1366 (1991)], it is possible to have near resonant scattering from nonsymmetric dimers. It is shown by direct density of states calculations as well as by a procedure similar to the random dimer model that protonated chains of alkyl-substituted polyanilines support extended electronic states at the Fermi energy when a disordered distribution of symmetric or asymmetric bipolarons is present. An extension of the random dimer model to include resonant scattering by nonsymmetric dimers is proposed. © 1994 The American Physical Society.