Non-linear transport by solitons in nanofibers of polymers in high magnetic field

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• 作者：N. Kirova^a ; ^{kirova@lps.u-psud.fr} ; S. Brazovskii^b ; A. Choi^c ; Y.W. Park^c
• 关键词：Magnetoconductance ; Conducting polymer ; Nanofiber ; Nonlinear transport ; High magnetic field
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：1 June, 2012
• 卷：407
• 期：11
• 页码：1939-1942
• 文件大小：576 K

摘要

Nonlinear local excitations like solitons, polarons, and bipolarons are known to be responsible for physical properties of conducting polymers. Recent experiments on nano-fibers in high electric and magnetic fields provide a further insight by demonstrating an effect of vanishing magnetoconductance (MC) in the polyacetylene (PA)鈥攊n contrast to other polymers. Here we present new experimental data and describe the theoretical model based on notion of solitons鈥攄imerization kinks which can carry either the spin or the charge; they are allowed only in the PA with its degenerate ground state. The solitons experience a confinement force due to the interchange coupling which is erased by the electric field and disappears above critical field strength. The unbinding by tunneling allows for the transport of individual solitons, which sweeps off the spins residing at electronic intragap states associated with polarons, hence the vanishing MC.