K. Yaji, Kenta Kuroda, Shunsuke Tsuda, Fumio Komori
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引用次数: 0
Abstract
We report that the spin vector of photoelectrons emitted from an atomic layer Pb grown on a germanium substrate [Pb/Ge(111)] can be controlled using an electric field of light. The spin polarization of photoelectrons excited by a linearly polarized light is precisely investigated by spin- and angle-resolved photoemission spectroscopy. The spin polarization of the photoelectrons observed in the mirror plane reverses between p- and s-polarized lights. Considering the dipole transition selection rule, the surface state of Pb/Ge(111) is represented by a linear combination of symmetric and asymmetric orbital components coupled with spins in mutually opposite directions. The spin direction of the photoelectrons is different from that of the initial state when the electric field vector of linearly polarized light deviates from p- or s-polarization conditions. The quantum interference in the photoexcitation process can determine the direction of the spin vector of photoelectrons.
我们报告了利用光的电场可以控制生长在锗基底 [Pb/Ge(111)] 上的原子层 Pb 发射的光电子的自旋矢量。利用自旋和角度分辨光发射光谱精确研究了线性偏振光激发的光电子的自旋极化。在镜面上观察到的光电子的自旋极化在 p 偏振光和 s 偏振光之间发生了逆转。考虑到偶极转换选择规则,Pb/Ge(111)的表面态由对称和非对称轨道成分的线性组合表示,它们的自旋方向相互相反。当线性偏振光的电场矢量偏离 p 偏振或 s 偏振条件时,光电子的自旋方向与初始状态不同。光激发过程中的量子干涉可以决定光电子自旋矢量的方向。
期刊介绍:
Microscopy, previously Journal of Electron Microscopy, promotes research combined with any type of microscopy techniques, applied in life and material sciences. Microscopy is the official journal of the Japanese Society of Microscopy.