Rashba-type spin splitting from interband scattering in quasiparticle interference maps
Rashba-type spin splitting from interband scattering in quasiparticle interference maps
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准粒子干涉图中带间散射的 Rashba 型自旋分裂
DOI：
10.1103/physrevb.87.245436
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发表时间：
2013
影响因子：
3.7
通讯作者：
D. Wegner
中科院分区：
文献类型：
--
作者：
M. Steinbrecher;H. Harutyunyan;C. R. Ast;D. Wegner
利用低温扫描隧道显微镜和光谱学对BiCu/Cu（111）表面合金进行了研究。我们观察到由缺陷和台阶边缘的散射引起的驻波。与以往对类似rashba型表面的研究不同，我们确定了来自不同带内和带间散射过程的多个散射向量。对驻波模式进行详细的能量依赖分析，可以定量确定频带色散，包括拉什巴分裂。结果与角分辨光电子能谱（ARPES）数据吻合较好，证明了该方法对确定Rashba体系能带结构的有效性。缺乏其他可能的散射通道将从自旋守恒和杂化效应的角度来讨论。结果为研究复杂自旋轨道耦合表面上的自旋相关散射开辟了新的可能性。
We have studied the BiCu/Cu(111) surface alloy using low-temperature scanning tunneling microscopy and spectroscopy. We observed standing waves caused by scattering off defects and step edges. Different from previous studies on similar Rashba-type surfaces, we identified multiple scattering vectors that originate from various intraband as well as interband scattering processes. A detailed energy-dependent analysis of the standing-wave patterns enables a quantitative determination of band dispersions, including the Rashba splitting. The results are in good agreement with angle-resolved photoelectron spectroscopy (ARPES) data and demonstrate the usefulness of this strategy to determine the band structure of Rashba systems. The lack of other possible scattering channels will be discussed in terms of spin conservation and hybridization effects. The results open new possibilities to study spin-dependent scattering on complex spin-orbit coupled surfaces.