Probing spin-charge relation by magnetoconductance in one-dimensional polymer nanofibers

A. Choi, K. H. Kim, S. J. Hong, M. Goh, K. Akagi, R. B. Kaner, N. N. Kirova, S. A. Brazovskii, A. T. Johnson, D. A. Bonnell, E. J. Mele, and Y. W. Park
Phys. Rev. B 86, 155423 – Published 12 October 2012
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  • INTRODUCTION
  • EXPERIMENT
  • RESULTS AND DISCUSSION
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • Supplemental Material
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    Abstract

    Polymer nanofibers are one-dimensional organic hydrocarbon systems containing conducting polymers where the nonlinear local excitations such as solitons, polarons, and bipolarons formed by the electron-phonon interaction were predicted. Magnetoconductance (MC) can simultaneously probe both the spin and charge of these mobile species and identify the effects of electron-electron interactions on these nonlinear excitations. Here, we report our observations of a qualitatively different MC in polyacetylene (PA) and in polyaniline (PANI) and polythiophene (PT) nanofibers. In PA, the MC is essentially zero, but it is present in PANI and PT. The universal scaling behavior and the zero (finite) MC in PA (PANI and PT) nanofibers provide evidence of Coulomb interactions between spinless charged solitons (interacting polarons which carry both spin and charge).

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    • Received 8 May 2012

    DOI:https://doi.org/10.1103/PhysRevB.86.155423

    ©2012 American Physical Society

    Authors & Affiliations

    A. Choi1,2, K. H. Kim1, S. J. Hong1, M. Goh3,4, K. Akagi3, R. B. Kaner5, N. N. Kirova6, S. A. Brazovskii7, A. T. Johnson8,9, D. A. Bonnell8, E. J. Mele9, and Y. W. Park1,*

    • 1Department of Physics and Astronomy, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea
    • 2WCU Flexible Nanosystems, Korea University, Seoul 136-713, Korea
    • 3Department of Polymer Chemistry, Kyoto University, Kyoto 615-8510, Japan
    • 4Institute of Advanced Composite Materials, KIST, Jeollabuk-do 565-902, Korea
    • 5Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095, USA
    • 6CNRS-UMR 8502, Batiment 510, Universite Paris-sud, 91405 Orsay Cedex, France
    • 7LPTMS-CNRS, Batiment 100, Universite Paris-Sud, 91405 Orsay Cedex, France
    • 8Nano-Bio Interface Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
    • 9Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

    • *ywpark@phya.snu.ac.kr

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    Vol. 86, Iss. 15 — 15 October 2012

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