层埃德尔斯坦效应
Layer Edelstein Effect
浏览论文内容
中文总结 AI 辅助
研究双层系统中电流诱导的层埃德尔斯坦效应，通过最小双层$k\cdot p$理论及对称性分析推导准则，确定其普遍存在，有两种表现形式，第一性原理计算证实效应及可行性，为电操控层分辨自旋极化提供框架。
中文摘要 AI 辅助
磁的电控制是实现下一代自旋电子功能的基本途径。在本快报中，我们在双层系统中引入了一种普遍的电流诱导自旋现象，称为层埃德尔斯坦效应（LEE），它是实空间中层霍尔效应的自然对应物。它由平面内电荷电流驱动，顶层和底层出现具有相反分量的层分辨自旋磁化，并可由外部电场控制。我们用最小双层$k\cdot p$理论确定了LEE的普遍存在性。通过对称性分析与一般双层堆叠框架相结合，我们推导出一个与模型无关的对称准则，表明LEE在广泛的非磁性双层堆叠系统中普遍存在。我们进一步表明，LEE有两种普遍表现形式：由对称性直接规定的明确的层相反自旋磁化分量，以及通过外部电场降低对称性而激活的分量。对堆叠双层MoSSe、MoTe₂和WTe₂的第一性原理计算证实了预测的效应，并说明了它们的实验可行性。我们的工作将LEE确立为双层系统的一种通用对称控制响应，为电产生和操纵层分辨自旋极化提供了一个统一的概念框架。
英文摘要
Electrical control of magnetism represents a fundamental route toward next-generation spintronic functionalities. In this Letter, we introduce a universal current-induced spin phenomenon in bilayer systems, termed the layer Edelstein effect (LEE), which serves as the natural counterpart of the layer Hall effect in real space. It is defined by the emergence of layer-resolved spin magnetizations with opposite components on the top and bottom layers, driven by an in-plane charge current and controllable by an external electric field. We establish the general existence of the LEE using a minimal bilayer $k \cdot p$ theory. By combining symmetry analysis with a general bilayer stacking framework, we derive a model-independent symmetry criterion demonstrating that the LEE is generically allowed in a broad class of nonmagnetic bilayer stacking systems. We further show that the LEE admits two universal manifestations: explicit layer-opposite spin magnetization components mandated directly by symmetry, and components become activated upon symmetry reduction by external electric fields. First-principles calculations on stacked bilayer MoSSe, MoTe$_2$ and WTe$_2$ confirm the predicted effect and illustrate their experimental feasibility. Our work establishes the LEE as a generic symmetry-governed response of bilayer systems, providing a unified conceptual framework for electrically generating and manipulating layer-resolved spin polarization.
