arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.01042cond-mat.mtrl-sci
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Ar/Co(0001)和Ar/Fe(110)界面自旋相关电子转移动力学理论

Theory of Spin-Dependent Electron Transfer Dynamics at Ar/Co(0001) and Ar/Fe(110) Interfaces

Moritz Müller, Pedro Miguel Echenique, Daniel Sánchez-Portal

摘要:

最近的核心孔时钟实验[物理。$\textbf{112}$,086801(2014)]表明,Ar/Co(0001)和Ar/Fe(110)界面处的电子注入时间的自旋依赖性与基于先前对相关系统的计算的预期不同。在这里,我们调和理论和实验,并证明所观察到的依赖性是植根于自旋分裂表面能带结构的细节。我们的从头计算结果表明,少数电子的注入速度明显快于多数电子,这与实验报告的超短注入时间一致。的动态是特别敏感的尺寸(在倒数空间)的投影带隙周围的$\overlineΓ$为两个基板在共振能量。一个简单的隧道模型,结合自旋相关的间隙尺寸进一步支持这些发现。

英文摘要:

Recent core-hole-clock experiments [Phys. Rev. Lett. $\textbf{112}$, 086801 (2014)] showed that the spin dependence of electron injection times at Ar/Co(0001) and Ar/Fe(110) interfaces is at variance with the expectations based on previous calculations for related systems. Here we reconcile theory and experiment, and demonstrate that the observed dependence is rooted in the details of the spin-split surface band structures. Our ab initio calculations back that minority electrons are injected significantly faster than majority electrons in line with the experimentally reported ultrashort injection times. The dynamics is particularly sensitive to the size (in reciprocal-space) of the projected band gaps around $\overlineΓ$ for both substrates at the resonance energies. A simple tunneling model incorporating the spin-dependent gap sizes further supports these findings.

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