Evidence of the charge-density wave state in polypyrrole nanotubes

Sarma, Abhisakh ; Sanyal, Milan K. ; Littlewood, Peter B. (2015) Evidence of the charge-density wave state in polypyrrole nanotubes Physical Review B, 91 (16). Article ID 165409. ISSN 0163-1829

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Official URL: https://journals.aps.org/prb/abstract/10.1103/Phys...

Related URL: http://dx.doi.org/10.1103/PhysRevB.91.165409


We present a detailed investigation of the low-frequency dielectric and conductivity properties of conducting polymer nanowires. Our results, obtained by connecting ∼107 nanowires in parallel, show that these polypyrrole nanowires behave like conventional Charge-density Wave (CDW) materials, in their nonlinear and dynamic response, together with scaling of relaxation time and conductivity. The observed Arrhenius law for both these quantities gives a CDW gap of 3.5 meV in the regime of temperature (∼40 K) in which the CDW state survives. We find good agreement with a theory of weakly pinned CDW, screened by thermally excited carriers across the CDW gap. The identification of polymer nanowires as CDW provides us a model system to investigate charge ordering owing to electrostatic interaction, relevant to a variety of systems from dusty plasma to molecular biology.

Item Type:Article
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ID Code:111438
Deposited On:30 Nov 2017 11:55
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