Direct observation of the spin polarization in Au atomic wires on Si(553)
Direct observation of the spin polarization in Au atomic wires on Si(553)
复制标题
直接观察 Si(553) 上 Au 原子线的自旋极化
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Taniguchi
中科院分区：
文献类型：
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作者：
H. Yeom;S. W. Jung;Jin Sung Shin;J. S. Kim;K. Kim;K. Miyamoto;T. Okuda;H. Namatame;A. Kimura;M. Taniguchi
用自旋和角度分辨光电子能谱研究了金诱导的金属原子线在邻位硅表面Si（553）上的自旋分辨电子能带结构。我们直接测量了三个部分填充的一维金属带，一个三分之一填充带，和近半填充带的双重带的自旋极化。对于半满的二重态，在费米能级附近观察到强的表观自旋极化，并伴有少量的面外自旋分量。这一观察结果与Rashba型自旋轨道分裂以及最近对Si（557）-Au的类似二重态的实验一致。相比之下，三分之一填充带在实验精度范围内没有显示出实质性的自旋极化，这表明自旋分裂要小得多。这些结果进行了讨论的起源的部分填充带和有趣的破缺对称基态在低温下观察到的。
The spin-resolved electronic band structure of Au-induced metallic atomic wires on a vicinal silicon surface, Si(553), was investigated using spin- and angle-resolved photoelectron spectroscopy. We directly measured the spin polarization of three partially filled one-dimensional metallic bands, a one-third-filled band, and the doublet of nearly half-filled bands. For the half-filled doublet, the strong apparent spin polarization was observed near the Fermi energy with a minor out-of-plane spin component. This observation is consistent with the Rashba-type spin-orbit splitting and with a recent experiment on a similar doublet of Si(557)-Au. In contrast, the one-third-filled band does not show a substantial spin polarization within the experimental accuracy, indicating a much smaller spin splitting, if any. These results are discussed for the origin of the partially filled bands and for the intriguing broken-symmetry ground state observed at low temperature.