One-dimensional plasmon in an atomic-scale metal wire.
One-dimensional plasmon in an atomic-scale metal wire.
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DOI：
10.1103/physrevlett.97.116802
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发表时间：
2006-09
影响因子：
8.6
通讯作者：
T. Nagao;S. Yaginuma;T. Inaoka;T. Sakurai
中科院分区：
文献类型：
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作者：
T. Nagao;S. Yaginuma;T. Inaoka;T. Sakurai
我们用高度准直的慢电子束的非弹性散射测量了Si(557)-Au表面原子线阵列中的一维等离子体。激发能的角度依赖关系清楚地表明了等离子体波沿导线的强一维限制和自由传播。用一种考虑了动态交换关联效应、线间相互作用和一维能带自旋轨道分裂的量子力学方案很好地解释了观察到的等离子体激元色散。尽管等离子体激元色散的质量特征与高密度自由电子气体的性质相似，但我们发现了由于强一维限制而产生的电子关联的实质性影响。
We have measured one-dimensional (1D) plasmons in an atom wire array on the Si(557)-Au surface by inelastic scattering of a highly collimated slow electron beam. The angular dependence of the excitation energy clearly indicates the strong 1D confinement and free propagation of the plasma wave along the wire. The observed plasmon dispersion is explained very well by a quantum-mechanical scheme which takes into account dynamic exchange-correlation effects, interwire interactions, and spin-orbit splitting of the 1D bands. Although the qualitative feature of the plasmon dispersion is reminiscent of that of a high-density free-electron gas, we detected the substantial influence of electron correlation due to strong 1D confinement.