Conduction mechanisms in polyacetylene nanofibres |
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| Institution: | 1. School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand;2. Department of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151-747, Republic of Korea;1. College of Computer Science and Technology, Harbin Engineering University, Harbin 150001, China;2. Department of Mathematics, Harbin Institute of Technology, Harbin 150001, China;1. Changchun Institute of Optics, Fine Mechanics and Physics Chinese Academy of Sciences, State Key Laboratory of Laser Interaction with Matter, Changchun, Jilin 130033, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;1. Space Astronomy Group, SSIF, ISITE, ISRO Satellite Centre, Bengaluru, India;2. Department of Physics, University of Calicut, Kerala, India |
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| Abstract: | The current–voltage (I–V) characteristics of individual nanofibres of lightly-doped polyacetylene show very strong nonlinearities. At low temperatures the I–V characteristics are consistent with Zener-type tunnelling, and independent of temperature and magnetic field. We propose that this behaviour arises from tunnelling of a segment of the conjugated bond system in the presence of an electric field, in analogy to the soliton-pair creation mechanism proposed by Maki for conduction in charge-density-wave (CDW) materials. A comparison is made with analogous tunnelling conduction mechanisms reported in CDW and spin-density-wave systems at low temperatures. At higher temperatures the I–V characteristics deviate from Zener-type behaviour and are temperature dependent, so other conduction mechanisms are important. |
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