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Influence of the core polarization on the dielectric properties of polyvalent metals

机译:磁芯极化对多价金属介电性能的影响

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We have measured the dispersion of plasmon excitations in polycrystalline Sn, Pb, Cd and Zn using electron energy-loss spectroscopy (EELS) in transmission. These metals show a remarkable deviation of their plasmon behaviour from standard theoretical expectations which can be attributed to the presence of shallow core levels in the energetic neighborhood of the plasmon energy. The position of the plasmon resonance in the long wavelength limit is in line with predictions from model assumptions taking into account the core level polarization effects. We show that not only the plasmon energy in the optical limit but also the plasmon dispersion is altered by the interaction of the charge carrier plasmon and the core level excitations.
机译:我们已经使用透射电子能量损失谱(EELS)测量了等离子激元在多晶Sn,Pb,Cd和Zn中的色散。这些金属的等离激元行为与标准理论预期值之间存在显着偏差,这可归因于在等离激元能量的高能区中存在浅核能级。等离子共振在长波长范围内的位置与模型假设的预测相符,其中考虑了核心能级极化效应。我们表明,不仅通过电荷载流子等离激元和核心能级激发的相互作用改变了在光学极限内的等离激元能量,而且等离激元色散也发生了变化。

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