Correlated motion of electrons on the Au(111) surface: anomalous acoustic surface-plasmon dispersion and single-particle excitations.
Correlated motion of electrons on the Au(111) surface: anomalous acoustic surface-plasmon dispersion and single-particle excitations.
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DOI：
10.1103/physrevlett.110.127405
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发表时间：
2013-03
影响因子：
8.6
通讯作者：
L. Vattuone;M. Smerieri;T. Langer;C. Tegenkamp;H. Pfnür;V. Silkin;E. Chulkov;P. Echenique;M. Rocca
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文献类型：
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作者：
L. Vattuone;M. Smerieri;T. Langer;C. Tegenkamp;H. Pfnür;V. Silkin;E. Chulkov;P. Echenique;M. Rocca
低维声表面等离子体（ASP）的线性色散为远低于光学频率的能量转换、传输和约束开辟了新的视角。虽然ASP存在于各种各样的材料中，从金属表面和超薄膜到石墨烯和拓扑绝缘体，但其特性在很大程度上仍未被探索。以Au（111）为模型系统，我们的实验和理论结合研究揭示了集体和单粒子激发之间有趣的相互作用，导致与肖克利表面态相关的ASP嵌入到带内跃迁中，而不会失去其尖锐特征和线性色散。
The linear dispersion of the low-dimensional acoustic surface plasmon (ASP) opens perspectives in energy conversion, transport, and confinement far below optical frequencies. Although the ASP exists in a wide class of materials, ranging from metal surfaces and ultrathin films to graphene and topological insulators, its properties are still largely unexplored. Taking Au(111) as a model system, our combined experimental and theoretical study revealed an intriguing interplay between collective and single particle excitations, causing the ASP associated with the Shockley surface state to be embedded within the intraband transitions without losing its sharp character and linear dispersion.