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arXiv 1302.6705cond-mat.dis-nncond-mat.str-el
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无序金属薄膜的光学性质:局域与集体现象

Optical properties of a disordered metallic film: local vs. collective phenomena

A. A. Osipov, A. N. Rubtsov

摘要:

本文应用双变量方法研究了具有偶极-偶极相互作用的无序金属粒子薄膜的光学响应问题。长程偶极-偶极相互作用使得空间相关效应显著,因此双变量技术提供了对相干势结果的理想改进。它示出的非局域性的效果是更明显的一个中等范围内的粒子浓度。并与非局部聚类方法进行了比较。结果表明,短程相关占在集群方法揭示自己的光谱特性的响应,而长期的现象保持在双重技术更明显的k-依赖的格林函数。

英文摘要:

We apply the dual-varibles approach to the problem of the optical response of an disordered film of metal particles with dipole-dipole interaction. Long range dipole-dipole interaction makes the effect of spatial correlations significant, so that dual-variables technique provides a desirable improvement of the coherent-potential results. It is shown that the effect of nonlocality is more pronounced for a medium-range concentration of the particles. The result is compared with the non-local cluster approach. It is shown that short-range correlations accounted in the cluster method reveal themselves in the spectral properties of the response, whereas long-range phenomena kept in the dual technique are more pronounced in the k-dependence of the Green's function.

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