Acoustic surface plasmon on Cu(111)
Acoustic surface plasmon on Cu(111)
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DOI：
10.1209/0295-5075/90/57006
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
K. Pohl;B. Diaconescu;G. Vercelli;L. Vattuone;V. M. Silkin;E. Chulkov;P. Echenique;M. Rocca
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文献类型：
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作者：
K. Pohl;B. Diaconescu;G. Vercelli;L. Vattuone;V. M. Silkin;E. Chulkov;P. Echenique;M. Rocca
与以前的报道相反，我们表明声表面等离子体（ASP）也存在于贵金属表面，从而证明了这种现象在部分填充肖克利表面态存在时的普遍性。角分辨高分辨率电子能量损失谱测量和表面损失函数的计算表明，Cu（111）的ASP是一个明显的特征，损失能量约为0.4 eV。色散确实是线性的（声学），斜率（声速）为（4.33±0.33）eVÅ，与最近的理论预测非常吻合。ASP可以发挥重要的作用，直到meV制度，排除普通表面等离子体，电子，声子和吸附动力学，以及化学反应和先进的显微镜。
Contrary to previous reports we show that the acoustic surface plasmon (ASP) exists also at noble-metal surfaces, thus demonstrating the generality of this phenomenon in the presence of partially filled Shockley surface states. Angle-resolved high-resolution electron energy loss spectroscopy measurements and calculations of the surface loss function indicate that for Cu(111) the ASP is a sharp feature up to a loss energy of about 0.4 eV. The dispersion is indeed linear (acoustic) with a slope (sound velocity) of (4.33±0.33) eVÅ in good agreement with recent theoretical predictions. The ASP can play important roles down to the meV regime, precluded to ordinary surface plasmons, for electron, phonon and adsorbate dynamics, as well as chemical reactions and advanced microscopies.