Low-temperature saturation of dephasing in heavily doped conjugated polymers

Based on our low temperature (down to 0.5 K) electronic transport studies of heavily doped polyacetylene and magnetotransport results reported for other heavily doped conjugated polymers, we demonstrate that the low-temperature saturation of electron dephasing found for metallic and semiconducting materials is also exhibited in conducting polymers. Such behavior explained by a model, which involves electron dephasing by two-level systems of a special type originating from initially symmetric defect configurations where the symmetry is partially lifted by disorder.