论文标题
巨大的手性诱导的极性自旋选择性
Giant chirality-induced spin-selectivity of polarons
论文作者
论文摘要
手性诱导的自旋选择性（CISS）效应通过许多有机分子和结构产生了强烈自旋依赖性的转运。它的发现提出了引人入胜的基本问题以及可能应用的前景。尽管没有磁性，但基本现象学是一种强烈不对称的磁磁性，现在可以理解是由旋转轨道耦合和手性几何形状的组合而产生的。然而，在室温下，即在有机系统中典型的自旋轨道偶联的能量尺度上观察到电子螺旋性的实验特征。这项工作表明，北极子携带的电流的新能量量表，即在存在强电子偶联的情况下。特别是，我们发现极性波动在CISS的两种表现中在运输测量中起着至关重要的作用 - 通过系统的自旋依赖性传输概率和不对称的磁倍率。
The chirality-induced spin selectivity (CISS) effect gives rise to strongly spin-dependent transport through many organic molecules and structures. Its discovery raises fascinating fundamental questions as well as the prospect of possible applications. The basic phenomenology, a strongly asymmetric magnetoresistance despite the absence of magnetism, is now understood to result from the combination of spin-orbit coupling and chiral geometry. However, experimental signatures of electronic helicity were observed at room temperature, i.e., at an energy scale that exceeds the typical spin-orbit coupling in organic systems by several orders of magnitude. This work shows that a new energy scale for CISS emerges for currents carried by polarons, i.e., in the presence of strong electron-phonon coupling. In particular, we found that polaron fluctuations play a crucial role in the two manifestations of CISS in transport measurements -- the spin-dependent transmission probability through the system and asymmetric magnetoresistance.
