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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Monday, 31 May 2010
(at 13:00 in room 115, Hallwachsstr. 3)
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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

Instituto de Fsica Enrique Gaviola
Universidad Nacional de Cordoba

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.

Invited by G. Cuniberti

last modified: 2021.05.05 Wed
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