Electric Field Induced Depinning of a Charged Soliton from an Impurity Center in Polyacetylene

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概要

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• The dynamics of a charged soliton pinned by an impurity in the presence of an elec-tric field is numerically studied by using Su-Schrieffer-Heeger's model for trans-polyacetylene. The field is introduced in terms of a time-dependent vector potentialwhich is included in the Hamiltonian in the form of a phase of the transfer integral.The time-dependent Schr6dinger equation for the electronic wave functions and theequation of motion for the lattice displacements are numerically integrated in a self-consistent way. When the field is lower than a certain threshold value, the soliton remains trapped and oscillates periodically around the impurity position. As the field isincreased, the time period of the oscillation becomes longer. When the field exceedsthe threshold value, the soliton is depinned and begins to move in one direction. Thethreshold field is estimated to be 10'-10' V/ cm, which is in rough agreement with thevalue obtained in experiments on polyacetylene lightly doped with AsF..

• 社団法人日本物理学会の論文
• 1991-01-15

著者

• ONO Yoshiyuki

  Toho University

• Terai Akira

  University Of Tokyo

• Ono Yoshiyuki

  Toho Univ. Chiba

関連論文

• Analysis of Two Dimensional Electronic States in Strong Magnetic Field by Random Matrix Model
• Electric Field Induced Depinning of a Charged Soliton from an Impurity Center in Polyacetylene

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