Magnetic adatom induced Skyrmion-like spin texture in surface electron waves.
Magnetic adatom induced Skyrmion-like spin texture in surface electron waves.
复制标题
磁性吸附原子在表面电子波中诱导类斯格明子自旋纹理。
DOI：
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发表时间：
2012
影响因子：
8.6
通讯作者：
S. Blügel
中科院分区：
文献类型：
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作者：
S. Lounis;A. Bringer;S. Blügel
当外来原子被放置在金属表面上时，周围的电子海会通过屏蔽额外的电荷来做出反应，从而导致振荡或波纹。在表面上，这些电子有时被限制在二维表面态，由于电子自旋轨道相互作用和反演不对称环境产生的拉什巴效应，其自旋简并性被提升。据信，至少对于单个吸附原子扫描隧道显微镜测量对拉什巴分裂不敏感；即，不会观察到电荷振荡的特征。根据散射理论，我们证明，如果有磁性，一个吸附原子就足以通过周围电子的感应自旋磁化来可视化拉什巴效应的存在，该磁化表现出扭曲的自旋纹理，被描述为两个相反手性的斯格明子波的叠加。
When a foreign atom is placed on a surface of a metal, the surrounding sea of electrons responds by screening the additional charge leading to oscillations or ripples. On surfaces, those electrons are sometimes confined to two-dimensional surface states, whose spin-degeneracy is lifted due to the Rashba effect arising from the spin-orbit interaction of electrons and the inversion asymmetric environment. It is believed that at least for a single adatom scanning tunneling microscopy measurements are insensitive to the Rashba splitting; i.e., no signatures in the charge oscillations will be observed. Resting on scattering theory, we demonstrate that, if magnetic, one single adatom is enough to visualize the presence of the Rashba effect in terms of an induced spin magnetization of the surrounding electrons exhibiting a twisted spin texture described as superposition of two Skyrmionic waves of opposite chirality.