论文标题
在量子井中的Rashba型自旋分裂的缩放定律
Scaling law for the Rashba-type spin splitting in quantum well films
论文作者
论文摘要
我们使用具有高分辨率的基于激光的自旋和角度分辨的光发射光谱（激光 - 摩擦），并首次通过实验确定了量子井状态（QWSS）的Rashba-Parameters（QWSS）的Rashba-Parameters通过膜的厚度和量子数，通过观察AG（111）（111）（111）（111）。基于密度函数理论的理论计算很好地复制了数据。最重要的是，我们找到了Rashba参数的缩放定律（$α_ {\ rm r} $），即$α_ {\ rm rm r} $的大小是由接口处的电荷密度和胶片和衬底之间的旋转孔耦合比缩放的，并且由单个直线量表表达了量子，并且量不远。新发现不仅对于了解QWS中的Rashba效应至关重要，而且还为胶片增长工程提供了基础，以微调2D异质结构系统中的自旋分裂。
We use laser-based spin- and angle-resolved photoemission spectroscopy (laser-SARPES) with high-resolution, and experimentally determine, for the first time, the Rashba-parameters of quantum well states (QWSs) systematically changing with the film thickness and the quantum numbers, through the observation of the Ag films grown on an Au(111) substrate. The data are very well reproduced by the theoretical calculations based on the density functional theory. Most importantly, we find a scaling law for the Rashba parameter ($α_{\rm R}$) that the magnitude of $α_{\rm R}$ is scaled by the charge density at the interface and the spin-orbit coupling ratio between the film and the substrate, and it is expressed by a single straight line regardless of the film thickness and the quantum numbers. The new finding not only is crucial to understand the Rashba effect in QWSs but also gives a foundation of film growth engineering to fine-tune the spin splitting in 2D heterostructure systems.
