Ast Christian R, Henk Jürgen, Ernst Arthur, Moreschini Luca, Falub Mihaela C, Pacilé Daniela, Bruno Patrick, Kern Klaus, Grioni Marco
Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany.
Phys Rev Lett. 2007 May 4;98(18):186807. doi: 10.1103/PhysRevLett.98.186807. Epub 2007 May 3.
The long-range ordered surface alloy Bi/Ag(111) is found to exhibit a giant spin splitting of its surface electronic structure due to spin-orbit coupling, as is determined by angle-resolved photoelectron spectroscopy. First-principles electronic structure calculations fully confirm the experimental findings. The effect is brought about by a strong in-plane gradient of the crystal potential in the surface layer, in interplay with the structural asymmetry due to the surface-potential barrier. As a result, the spin polarization of the surface states is considerably rotated out of the surface plane.
通过角分辨光电子能谱测定发现，长程有序表面合金Bi/Ag(111)由于自旋轨道耦合，其表面电子结构呈现出巨大的自旋分裂。第一性原理电子结构计算充分证实了实验结果。这种效应是由表面层中晶体势的强面内梯度与表面势垒引起的结构不对称相互作用导致的。结果，表面态的自旋极化显著地偏离了表面平面。
