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arXiv 1306.6831cond-mat.mtrl-scicond-mat.mes-hall
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Au(111)表面自旋翻转跃迁与Rashba模型的偏离

Spin-flip transitions and departure from the Rashba model in the Au(111) surface

Julen Ibañez-Azpiroz, Aitor Bergara, Evgeny Ya. Sherman, Asier Eiguren

摘要:

我们详细分析了Rashba原型金(111)贵金属表面在周期性含时电场作用下的自旋反转激发。我们的计算纳入了完整的旋量结构的自旋极化的表面状态,并采用Wannier为基础的计划的自旋翻转矩阵元素。我们发现与表面态相关的自旋翻转激发具有重要的角调制,这在标准Rashba模型\cite{rashba}中是完全不存在的。此外,我们证明了自旋反转吸收率的最大值是模型预测的两倍左右。这些结果表明,虽然Rashba模型准确地描述了光谱和自旋极化,它不能完全考虑表面态的动力学性质。

英文摘要:

We present a detailed analysis of the spin-flip excitations induced by a periodic time-dependent electric field in the Rashba prototype Au(111) noble metal surface. Our calculations incorporate the full spinor structure of the spin-polarized surface states and employ a Wannier-based scheme for the spin-flip matrix elements. We find that the spin-flip excitations associated with the surface states exhibit an important angular modulation which is completely absent in the standard Rashba model \cite{rashba}. Furthermore, we demonstrate that the maximum of the calculated spin-flip absorption rate is about twice the model prediction. These results show that although the Rashba model accurately describes the spectrum and spin polarization, it does not fully account for the dynamical properties of the surface states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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