Spectroscopic evidence of quasi-one-dimensional metallic Rashba spin split bands on Si(111)5x2-Au surface
Spectroscopic evidence of quasi-one-dimensional metallic Rashba spin split bands on Si(111)5x2-Au surface
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Si(111)5x2-Au 表面准一维金属 Rashba 自旋分裂带的光谱证据
DOI：
10.1103/physrevb.101.045430
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发表时间：
2020
影响因子：
3.7
通讯作者：
Taichi Okuda
中科院分区：
文献类型：
--
作者：
Kazuaki Taguchi;Kazuki Sumida;Yuki Okuda;Koji Miyamoto;Akio Kimura;Tamio Oguchi;Taichi Okuda
利用自旋和角度分辨光电子能谱和第一性原理计算揭示了金表面准一维金属带中Rashba效应引起的自旋极化。观察到小而清晰的自旋极化及其相对于点的符号反转，表明自旋极化态的Rashba起源。与二维电子态的Rashba效应的螺旋切向自旋织构不同，在某些特定的点上不仅观察到面内自旋极化，而且观察到明显的面外自旋极化，这可能是由Au原子周围的面内电荷分布各向异性引起的.所观察到的特殊的自旋织构的样品是定性的第一性原理计算的结果，最近提出的表面重建模型的Kwon和康暗示的结构模型的有效性的基础上，在很好的协议。
Spin polarization by Rashba effect in the quasi-one-dimensional metallic bands of-Au surface is revealed by spin- and angle-resolved photoelectron spectroscopy and the first-principles calculation. Small but clear spin polarization and its sign reversal with respect to thepoint is observed indicating the Rashba origin of the spin-polarized states. Deviating from the typical helical tangential spin texture of normal Rashba effect of two-dimensional electronic states, not only in-plane but significant out-of-plane spin polarization probably caused by the anisotropic in-plane charge distribution around Au atoms is observed at some specificpoints. The observed peculiar spin texture of the sample is qualitatively in good agreement with the results of the first-principles calculation based on the recently proposed surface reconstruction model by Kwon and Kang implying the validity of the structural model.