论文标题
远程电流引起的手性晶体的自旋积累
Long-range current-induced spin accumulation in chiral crystals
论文作者
论文摘要
手性材料与人的手相似，具有可区分的右撇子和左撇子对映异构体，这些对映异构体可能对外部刺激的响应方式有所不同。在这里，我们首次使用基于密度功能理论（DFT）+PAOFLOW计算的方法来定量估计所谓的共线Rashba-Edelstein效应（REE），该效应（REE）产生了平行于电荷电流的自旋积累，并且可以表现为手性依赖性电荷对旋转的旋转对旋转的旋转率转换。重要的是，我们揭示了电流诱导的旋转积累在本质上是由带有Weyl Spin-Orbit耦合的手性系统中存在的晶体对称性产生的准抗旋转螺旋。与常规REE相反，可以在大距离内保存自旋运输，这与最近对某些手性材料的观察结果一致。例如，这允许从自旋积累中产生自旋电流，开辟了用于设计固态自旋装置的新型途径。
Chiral materials, similarly to human hands, have distinguishable right-handed and left-handed enantiomers which may behave differently in response to external stimuli. Here, we use for the first time an approach based on the density functional theory (DFT)+PAOFLOW calculations to quantitatively estimate the so-called collinear Rashba-Edelstein effect (REE) that generates spin accumulation parallel to charge current and can manifest as chirality-dependent charge-to-spin conversion in chiral crystals. Importantly, we reveal that the spin accumulation induced in the bulk by an electric current is intrinsically protected by the quasi-persistent spin helix arising from the crystal symmetries present in chiral systems with the Weyl spin-orbit coupling. In contrast to conventional REE, spin transport can be preserved over large distances, in agreement with the recent observations for some chiral materials. This allows, for example, the generation of spin currents from spin accumulation, opening novel routes for the design of solid-state spintronics devices.
