二元库仑系统中的第二等离激元和集体模
Second Plasmon and Collective Modes in Binary Coulomb Systems
摘要：
在由两种不同的带电物种组成的系统中，我们确定了第二个低频等离子体激元的激发。在强耦合时，高频（第一）和低频（第二）等离子体激元的双峰取代了在弱耦合时盛行的单等离子体激元激发。我们观察到的第二个等离子体从声学戈德斯通型模式与短程相互作用的范围扩展到无穷大。
英文摘要：
In a system consisting of two different charged species we identify the excitation of a second, low frequency plasmon. At strong coupling the doublet of high frequency (first) and low frequency (second) plasmons replaces the single plasmon excitation that prevails at weak coupling. We observe the formation of the second plasmon from the acoustic Goldstone type mode associated with short range interaction as the range is extended to infinity.
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