Real-space Green's function approach to angle-resolved resonant photoemission: Spin polarization and circular dichroism in itinerant magnets
Real-space Green's function approach to angle-resolved resonant photoemission: Spin polarization and circular dichroism in itinerant magnets
复制标题
实空间格林函数方法实现角度分辨共振光发射：流动磁体中的自旋极化和圆二色性
DOI：
10.1103/physrevb.88.115121
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发表时间：
2013
影响因子：
3.7
通讯作者：
Fabiana Da Pieve and Peter Krueger
中科院分区：
文献类型：
--
作者：
H. Morishita;S. Kobayashi;H. Kato;S. Yamasaki;Y. Suzuki;and N. Mizuochi;Fabiana Da Pieve and Peter Krueger
基于实空间多重散射绿色函数方法，提出了磁性表面自旋和角度分辨共振光电发射的第一性原理方法。并将其应用于Fe吸收边附近的圆偏振X射线激发的Fe（010）价带光电子谱。当光子能量被扫过Fe共振时，价带谱在绝对和相对峰强度、自旋偏振度和光偏振依赖性方面被强烈修改。自旋极化谱中的新峰被确定为自旋翻转跃迁引起的自旋混合芯孔的交换衰变。通过与单原子和能带结构数据的比较，表明原子内散射和多重散射效应都对光谱有很大的影响。我们展示了如何不同的功能链接到不同的轨道对称性的状态在theband不同的共振效应增强。分析了不同几何形状的入射光和电子发射方向下圆二色性和自旋极化的出现和起源，为以后的实验提供了指导。
A first-principles approach, based on the real-space multiple scattering Green's function method, is presented for spin- and angle-resolved resonant photoemission from magnetic surfaces. It is applied to the Fe(010) valence band photoemission excited with circularly polarized x rays around the Feabsorption edge. When the photon energy is swept through the Feresonance, the valence band spectra are strongly modified in terms of absolute and relative peak intensities, degree of spin polarization, and light polarization dependence. New peaks in the spin-polarized spectra are identified as spin-flip transitions induced by exchange decay of spin-mixed core holes. By comparison with single-atom and band-structure data, it is shown that both intra-atomic and multiple scattering effects strongly influence the spectra. We show how the different features linked to states of different orbital symmetry in theband are differently enhanced by the resonant effect. The appearance and origin of circular dichroism and spin polarization are analyzed for different geometries of light incidence and electron emission direction, providing guidelines for future experiments.