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arXiv 2307.06201cond-mat.mes-hall
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通过量子干涉实现手性控制的自旋散射

Chirality-controlled spin scattering through quantum interference

Jan M. van Ruitenbeek, Richard Korytár, Ferdinand Evers

AI总结:

针对手性诱导自旋选择性缺乏统一理论解释的问题,本文构建含螺旋散射中心与自旋-轨道作用的自由电子线模型,解析推导自旋散射率,揭示自旋选择性散射源于分波相长干涉的机制。

摘要:

手性诱导的自旋选择性已在诸多实验中被报道,但目前尚未形成被普遍接受的理论解释。本文提出了一个简单的模型系统:一条直圆柱形自由电子线,其中包含一串螺旋排列的原子散射中心,且存在自旋-轨道相互作用。该简单模型的优势在于能够推导出自旋散射率的解析表达式,从而便于追溯该效应的起源。研究发现,自旋选择性散射可被视为由自旋-轨道项散射的分波相长干涉所致。结果表明,前向散射率与自旋无关,而背向散射在较宽的能量窗口内具有自旋依赖性。尽管该模型未涵盖电子通过手性分子传输的全部细节,但它清晰揭示了一种可在手性系统中发挥作用的机制。

英文摘要:

Chirality-induced spin selectivity has been reported in many experiments, but a generally accepted theoretical explanation has not yet been proposed. Here, we introduce a simple model system of a straight cylindrical free-electron wire, containing a helical string of atomic scattering centers, with spin-orbit interaction. The advantage of this simple model is that it allows deriving analytical expressions for the spin scattering rates, such that the origin of the effect can be easily followed. We find that spin-selective scattering can be viewed as resulting from constructive interference of partial waves scattered by the spin-orbit terms. We demonstrate that forward scattering rates are independent of spin, while back scattering is spin dependent over wide windows of energy. Although the model does not represent the full details of electron transmission through chiral molecules, it clearly reveals a mechanism that could operate in chiral systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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