Lifetime of the surface magnetoplasmons in metallic nanoparticles
Lifetime of the surface magnetoplasmons in metallic nanoparticles
复制标题
金属纳米粒子表面磁等离子体的寿命
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
D. Weinmann
中科院分区：
文献类型：
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作者：
G. Weick;D. Weinmann
研究了外加磁场对金属纳米粒子集体电子激发的影响。通常的表面等离子体激元对应于电子相对于离子背景的集体振荡沿平行于磁场的方向存在，而垂直平面上的分量受磁场的影响而产生两个频率依赖于场的集体模，即表面磁等离子体。我们通过它们与粒子-空穴激发的耦合分析了这些集体激发的衰变，并确定了它们的寿命是如何被磁场改变的。特别地，我们证明了通常的表面等离激元的寿命不受磁场的影响，而两个表面磁等离激元的寿命呈现出弱的磁场依赖性。建议进行光学光谱学实验，在这些实验中可以观察到表面磁等离子体的特征。
We study the influence of an external magnetic field on the collective electronic excitations in metallic nanoparticles. While the usual surface plasmon corresponding to the collective oscillation of the electrons with respect to the ionic background persists in the direction parallel to the magnetic field, the components in the perpendicular plane are affected by the field and give rise to two collective modes with field-dependent frequencies, the surface magnetoplasmons. We analyze the decay of these collective excitations by their coupling to particle-hole excitations and determine how their lifetimes are modified by the magnetic field. In particular, we show that the lifetime of the usual surface plasmon is not modified by the magnetic field, while the lifetime of the two surface magnetoplasmons present a weak magnetic-field dependence. Optical spectroscopy experiments are suggested in which signatures of the surface magnetoplasmons may be observed.