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Bloch oscillations in organic and inorganic polymers
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. University of Brasilia, Brazil.
University of Brasilia, Brazil.
University of Brasilia, Brazil.
University of Brasilia, Brazil.
2017 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 146, no 14, 144903Article in journal (Refereed) Published
Abstract [en]

The transport of polarons above the mobility threshold in organic and inorganic polymers is theoretically investigated in the framework of a one-dimensional tight-binding model that includes lattice relaxation. The computational approach is based on parameters for which the model Hamiltonian suitably describes different polymer lattices in the presence of external electric fields. Our findings show that, above critical field strengths, a dissociated polaron moves through the polymer lattice as a free electron performing Bloch oscillations. These critical electric fields are considerably smaller for inorganic lattices in comparison to organic polymers. Interestingly, for inorganic lattices, the free electron propagates preserving charge and spin densities localization which is a characteristic of a static polaron. Moreover, in the turning points of the spatial Bloch oscillations, transient polaron levels are formed inside the band gap, thus generating a fully characterized polaron structure. For the organic case, on the other hand, no polaron signature is observed: neither in the shape of the distortion-those polaron profile signatures are absent-nor in the energy levels-as no such polaron levels are formed during the simulation. These results solve controversial aspects concerning Bloch oscillations recently reported in the literature and may enlighten the understanding about the charge transport mechanism in polymers above their mobility edge. Published by AIP Publishing.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2017. Vol. 146, no 14, 144903
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-137088DOI: 10.1063/1.4979950ISI: 000399078700032PubMedID: 28411599OAI: oai:DiVA.org:liu-137088DiVA: diva2:1093272
Note

Funding Agencies|CNPq; CAPES; FAP-DF; FINATEC; Brazilian Research Council FAP-DF Grant [0193.000942/2015]; Brazilian Ministry of Planning [DIPLA 005/2016]

Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2017-05-05

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Ribeiro, Luiz Antonio
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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