论文标题
手性诱导的自旋选择性的分析模型
An analytic model of chiral-induced spin selectivity
论文作者
论文摘要
已知有机材料具有较长的自旋扩散时间，源自这些系统中观察到的通常很小的自旋轨道耦合。从这个角度来看，充当有效自旋选择器的手性分子构成了一个难题，在近年来引起了很多关注。在这里，我们重新审视了手性诱导的自旋选择性（CISS）的物理起源，并提出了一个简单的分析模型来描述它。该模型将手性分子视为一种各向异性线，其分子偶极矩与电线轴任意对齐，因此非常笼统。重要的是，它表明分子的螺旋结构不需要观察CISS，其他手性非螺旋分子也可以视为CISS效应的潜在候选。我们还表明，建议的简单模型捕获了实验中观察到的CISS的主要特征，而无需先前研究中使用的其他约束。结果为理解其他相关现象的方式铺平了道路，其中CISS效应起着至关重要的作用。
Organic materials are known to feature long spin-diffusion times, originating in a generally small spin-orbit coupling observed in these systems. From that perspective, chiral molecules acting as efficient spin selectors pose a puzzle, that attracted a lot of attention during the recent years. Here we revisit the physical origins of chiral-induced spin selectivity (CISS), and propose a simple analytic minimal model to describe it. The model treats a chiral molecule as an anisotropic wire with molecular dipole moments aligned arbitrarily with respect to the wire's axes, and is therefore quite general. Importantly, it shows that helical structure of the molecule is not necessary to observe CISS and other chiral non-helical molecules can also be considered as a potential candidates for CISS effect. We also show that the suggested simple model captures the main characteristics of CISS observed in experiment, without the need for additional constraints employed in the previous studies. The results pave the way for understanding other related physical phenomena where CISS effect plays an essential role.
