Low-dimensional plasmons in atom-scale metallic objects
Low-dimensional plasmons in atom-scale metallic objects
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原子尺度金属物体中的低维等离子体激元
DOI：
10.1117/12.841191
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Nagao
中科院分区：
文献类型：
--
作者：
F.Homae;H.Watanabe;T.Otobe;T.Nakano;T.Go;Y.Konishi;G.Taga;Y.Hiraoka;T. Nagao
给出了原子薄金属薄膜和金属线中等离子体激发的例子。具有高动量和能量分辨率的低能电子能量损失谱使我们能够确定中至近红外频率范围内的强色散低能集体激发，动量范围高达~ 0.1 Å-1。色散关系远离光线，强烈地反映了纳米到Ångstrom尺度的形状和尺寸效应。二维等离子体在金属原子片上被观测到，一维等离子体在一些金属原子链上也被测量到。通过对等离子体带色散的直接测量，我们能够检测到这些最终微小系统中的载流子掺杂效应、电子相关效应和rashba自旋轨道分裂效应。
Examples of plasmonic excitations in atomically thin metal films and wires are presented. The low-energy electron energy loss spectroscopy with high momentum and energy resolutions allows us to determine the strongly dispersing low-energy collective excitation from mid-to near-infrared frequency range with momentum range up to∼ 0.1 Å-1. The dispersion relation is far apart from the light line and strongly reflects the shape and size effects in nanometer to Ångstrom scale. The two-dimensional type plasmon is observed in metallic atom sheets and the one-dimensional type plasmons are also measured from some metallic atom chains. From the direct measurement of their plasmonic band dispersion, we are able to detect the carrier doping effect, electronic correlation effect, and Rashba-spin-orbit splitting effect in these ultimately tiny systems.