Direct mapping of spin and orbital entangled wave functions under interband spin-orbit coupling of giant Rashba spin-split surface states
Direct mapping of spin and orbital entangled wave functions under interband spin-orbit coupling of giant Rashba spin-split surface states
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DOI：
10.1103/physrevb.95.041111
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发表时间：
2017-01
影响因子：
3.7
通讯作者：
R. Noguchi;K. Kuroda;K. Yaji;Katsuyoshi Kobayashi;M. Sakano;A. Harasawa;T. Kondo;Fumio Komori;Shik Shin
中科院分区：
文献类型：
--
作者：
R. Noguchi;K. Kuroda;K. Yaji;Katsuyoshi Kobayashi;M. Sakano;A. Harasawa;T. Kondo;Fumio Komori;Shik Shin
利用自旋和角度分辨光电子能谱（SARPES）结合偏振可变激光，研究了Bi/Ag（111）和Bi/Cu（111）表面合金在Rashba自旋劈裂态带间杂化下的自旋轨道耦合效应.除了传统的Rashba自旋分裂的光电子谱带映射外，表面波函数的不同轨道和自旋部分被直接映射到能量-动量空间。它是明确地表明，带间自旋-轨道耦合修改的自旋和轨道特性的Rashba表面状态导致丰富的自旋-轨道纠缠和显着的动量依赖性的自旋极化。因此，杂化强烈偏离标准Rashba模型的自旋和轨道特征。利用第一性原理计算方法提出的带间自旋-轨道杂化下的复杂自旋织构，用p-和s-偏振光的组合，通过SARPES实验得到了解释。
We use spin- and angle-resolved photoemission spectroscopy (SARPES) combined with polarization-variable laser and investigate the spin-orbit coupling effect under interband hybridization of Rashba spin-split states for the surface alloys Bi/Ag(111) and Bi/Cu(111). In addition to the conventional band mapping of photoemission for Rashba spin-splitting, the different orbital and spin parts of the surface wavefucntion are directly imaged into energy-momentum space. It is unambiguously revealed that the interband spin-orbit coupling modifies the spin and orbital character of the Rashba surface states leading to the enriched spin-orbital entanglement and the pronounced momentum dependence of the spin-polarization. The hybridization thus strongly deviates the spin and orbital characters from the standard Rashba model. The complex spin texture under interband spin-orbit hybridyzation proposed by first-principles calculation is experimentally unraveled by SARPES with a combination of p- and s-polarized light.