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Effects of spin-spin interactions on magnetoresistance in disordered organic semiconductors

机译:自旋-自旋相互作用对无序有机半导体中磁阻的影响

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摘要

A recent theory of magnetoresistance in positionally disordered organic semiconductors is extended to include exchange and dipolar couplings between polarons. Through the use of spin-dependent perturbation theory in the percolative transport regime, analytic results are discovered when the hyperfine, exchange, and dipolar interactions have little time to operate between hopping events. We find an angle-of-field dependence of the magnetoresistance that agrees with previous experiments and numerical simulations. In addition, we report on magnetoresistive behavior that critically depends upon the amount of anisotropy in the dipolar interaction.
机译:位置无序有机半导体中磁阻的最新理论已扩展到包括极化子之间的交换和偶极耦合。通过在渗流输运机制中使用自旋相关的扰动理论,当超精细,交换和偶极相互作用在跳跃事件之间没有时间进行操作时,就会发现分析结果。我们发现磁阻的场角依赖性与先前的实验和数值模拟一致。此外,我们报告了磁阻行为,该行为主要取决于偶极相互作用中的各向异性量。

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