The crucial role of decoherence in the electronic transport of conductive polymers: Polyanilines as a case study
Raul A. Bustos Marun
Universidad Nacional de Cordoba

May 31, 2010, 1 p.m.


In this seminar we attempt to elucidate the nature of conductivity in polymers by taking the acid-base doped polyaniline (PAni) as a case study. We evaluate the PAni conductance by using realistic ab initio parameters and including decoherent processes within the minimal parameterization model of DAmato-Pastawski. In contrast to general wisdom, which associates the conducting state with coherent propagation in a periodic polaronic lattice, we show that decoherence can account for high conductance in the ground state but strongly disordered bipolaronic lattice. Hence, according to our results, there is no need of considering a mix model of "conducting" polaronic lattice islands separated by "insulating" bipolaronic lattice strands as is usually assumed for PAni. We also find that without dephasing events, even very short strands of bipolaronic lattices are not able to sustain electronic transport.



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The crucial role of decoherence in the electronic transport of conductive polymers: Polyanilines as a case study
Raul A. Bustos Marun
Universidad Nacional de Cordoba

May 31, 2010, 1 p.m.


In this seminar we attempt to elucidate the nature of conductivity in polymers by taking the acid-base doped polyaniline (PAni) as a case study. We evaluate the PAni conductance by using realistic ab initio parameters and including decoherent processes within the minimal parameterization model of DAmato-Pastawski. In contrast to general wisdom, which associates the conducting state with coherent propagation in a periodic polaronic lattice, we show that decoherence can account for high conductance in the ground state but strongly disordered bipolaronic lattice. Hence, according to our results, there is no need of considering a mix model of "conducting" polaronic lattice islands separated by "insulating" bipolaronic lattice strands as is usually assumed for PAni. We also find that without dephasing events, even very short strands of bipolaronic lattices are not able to sustain electronic transport.



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