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On the existence of a local dipolar plasmon mode in doped small gold atomic arrays

机译:掺杂小金原子阵列中局部偶极等离子体激元模式的存在

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Impurity doping in atomic chains provides a potentially effective way to adjust its electronic excitation. Recently, it was reported that doping transition-metal atoms into small gold atomic chains induces a local dipolar plasmon mode which corresponds to charge oscillations around the impurity atoms, whereas our studies indicate that such a local mode does not exist. In this paper, using time-dependent density functional theory, we extensively investigate the excitation properties of plasmons in doped gold nanostructures. Our results show that all the plasmon peaks are affected by impurity, and the corresponding plasmon modes mutate into different forms compared to pure gold atomic chains. The propagation of charge oscillations in some plasmon modes is blocked in the doped chain, so that the charges oscillate mainly in half of the chain. Furthermore, the 5d electrons of gold atoms reduce the energies and intensities of plasmon resonances for both the transverse and longitudinal modes, and cause the end and center features of the induced charge distributions to nearly vanish in the transverse plasmon modes.
机译:原子链中的杂质掺杂提供了一种潜在的有效方式来调节其电子激发。最近,有报道称将过渡金属原子掺杂到小的金原子链中会引起局部偶极等离子体激元模式,该模式对应于杂质原子周围的电荷振荡,而我们的研究表明这种局部模式不存在。在本文中,我们使用随时间变化的密度泛函理论,广泛研究了掺杂金纳米结构中等离激元的激发特性。我们的结果表明,所有等离激元峰均受杂质影响,并且与纯金原子链相比,相应的等离激元模式突变为不同形式。在某些等离激元模式下,电荷振荡的传播在掺杂链中被阻止,因此电荷主要在链的一半处振荡。此外,金原子的5d电子同时降低了横向和纵向模式的等离激元共振的能量和强度,并导致感应电荷分布的末端和中心特征在横向等离激元模式下几乎消失。

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