Influence of electron–phonon interaction on soliton mediated spin–charge conversion effects in two-component polymer model

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• 作者：S. Sergeenkov ; F. Moraes ; C. Furtado ; F.M. Araujo-Moreira
• 关键词：Conducting polymers ; Electron– ; phonon interactions ; Solitons ; Charge fractionalization ; Spin– ; charge conversion effects
• 刊名：Annals of Physics
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：325
• 期：2
• 页码：455-464
• 全文大小：655 K

文摘

By mapping a Hubbard-like model describing a two-component polymer in the presence of strong enough electron–phonon interactions (κ) onto the system of two coupled nonlinear Schrödinger equations with U(2) symmetry group, some nontrivial correlations between topological solitons mediated charge Q and spin S degrees of freedom are obtained. Namely, in addition to a charge fractionalization and reentrant like behavior of both Q(κ) and S(κ), the model also predicts a decrease of soliton velocity with κ as well as spin–charge conversion effects which manifest themselves through an explicit S(Q,Ω) dependence (with Ω being a mixing angle between spin-up and spin-down electron amplitudes). A possibility to observe the predicted effects in low-dimensional systems with charge and spin soliton carriers is discussed.