Bi_ xPb_{1-x} /Ag（111）表面合金中的非常规费米面自旋织构
Unconventional Fermi surface spin textures in the Bi_xPb_{1-x}/Ag(111) surface alloy
摘要：
Bi_ xPb_{1-x} /Ag（111）合金表面态的Fermi能和Rashba能可以通过改变组分参数x同时进行调节。我们报告了通过自旋和角度分辨光电子能谱观察到的非常规费米表面自旋纹理，这些纹理与费米表面在x=0.5处发生的拓扑转变相关。我们表明，表面状态保持完全自旋极化合金化后，自旋极化矢量近似切向恒定的能量轮廓。我们讨论了自旋输运的拓扑转变的影响。
英文摘要：
The Fermi and Rashba energies of surface states in the Bi_xPb_{1-x}/Ag(111) alloy can be tuned simultaneously by changing the composition parameter x. We report on unconventional Fermi surface spin textures observed by spin and angle-resolved photoemission spectroscopy {that are correlated with a topological transition of the Fermi surface occurring at x=0.5. We show that the surface states remain fully spin polarized upon alloying and that the spin polarization vectors are approximately tangential to the constant energy contours. We discuss the implications of the topological transition for the transport of spin.
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