Spin-orbit influence on dz2-type surface state at Ta(110)

Spin-orbit influence on dz2-type surface state at Ta(110)
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自旋轨道对 Ta(110) dz2 型表面态的影响

DOI:
10.1103/physrevb.92.161408
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发表时间:
2015
期刊:
Phys. Rev. B (R)
影响因子:
--
通讯作者:
M. Donath
M. Donath
中科院分区:
--
文献类型:
--
作者:
H. Wortelen;K. Miyamoto;H. Mirhosseini;T. Okuda;A. Kimura;D. Thonig;J. Henk;M. Donath

文献摘要

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通过自旋和角度分辨光电子发射和电子结构计算,研究了自旋轨道相互作用对 Ta(110) 占据表面态的影响。表面态出现在结合能为 0.45 eV 的对称带隙中,并表现出有效质量约为 的类自由电子色散。用偏振光激发的光电发射结果证实了接近状态的预测类型对称性。有限的自旋解析数据揭示了纯 Rashba 型自旋纹理,其 Rashba 参数为 。这些发现清楚地证明了自旋轨道耦合对表面状态的巨大影响,并解决了对此问题的长期分歧。
The influence of spin-orbit interaction on an occupied surface state at Ta(110) is investigated with spin- and angle-resolved photoemission and electronic structure calculations. The surface state appears in a symmetry gap at a binding energy of 0.45 eV atand exhibits a free-electron-likedispersion with an effective massof aboutalong. Photoemission results for excitation with- and-polarized light confirm the predicted-type symmetry of the state close to. Spin-resolved data for finitereveal a pure Rashba-type spin texture with a Rashba parameter of. These findings clearly prove a sizable impact of spin-orbit coupling on thesurface state and resolve a longstanding disagreement on this issue.