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Role of hybridization in the Rashba splitting of noble metal monolayers on W(110)

机译:杂交在W(110)上贵金属单层的Rashba分裂中的作用

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摘要

In contradiction to the nature of the spin-orbit driven Rashba splitting of surface states which increases with atomic number, Shikin et al. [Phys. Rev. Lett. 100, 057601 (2008)] have observed that the size of the splitting in Au overlayers on W(110) is smaller than for Ag overlayers. In the framework of first-principle density functional theory, we have studied the origin of the Rashba splitting at Au/Ag overlayers on the W(110) surface. We show how the asymmetric behavior of the wave function in the vicinity of the surface atom nucleus, in addition to the strength of the nuclear potential gradient, plays a crucial role for the size of the splitting. The influence of the electronic structure and spin dependent hybridization on the Rashba splitting is discussed. The asymmetric behavior of the surface wave function originates from the surface-interface sp-d hybridization. We find that a spin dependent hybridization in the Ag overlayer influences strongly the size of the Rashba splitting.
机译:与自旋轨道驱动的表面态的拉什巴分裂的性质相反,后者随着原子序数的增加而增加。 [物理牧师100,057601(2008)]已经观察到W(110)上Au覆盖层的分裂尺寸小于Ag覆盖层的分裂尺寸。在第一原理密度泛函理论的框架内,我们研究了W(110)表面Au / Ag叠层上Rashba分裂的起源。我们展示了表面原子核附近的波函数的不对称行为,除了核势梯度的强度,如何对分裂的大小起着至关重要的作用。讨论了电子结构和自旋依赖性杂交对Rashba分裂的影响。表面波函数的不对称行为源自表面界面sp-d杂交。我们发现,Ag覆盖层中的自旋依赖性杂交强烈影响Rashba分裂的大小。

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