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arXiv 2102.05423cond-mat.dis-nn
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Lévy无序介质中相干波的统计特性

Statistics of coherent waves inside media with Lévy disorder

L. A. Razo-López, Azriel Z. Genack, Victor A. Gopar

摘要:

具有重尾无序分布的结构在自然界中广泛存在。这种系统的演化,如觅食或地震的发生,通常是根据一系列不连贯的事件来分析的。但是,研究波在这种系统中的传播或发射需要考虑相干散射。本文研究了一维随机介质中的波能量分布,其中散射体间距服从Lévy $α$稳定分布,其特征是以指数$α$为幂律衰减。我们表明,强度和对数强度的平均值是根据透射率和进入样品的深度的对数的平均值提高到功率$α$。将样品中的深度映射到散射元素的数量,产生与标准随机介质中的安德森局域化相同的强度统计。这允许在随机介质中的无序分布和波相干性的影响的分离。

英文摘要:

Structures with heavy-tailed distributions of disorder occur widely in nature. The evolution of such systems, as in foraging for food or the occurrence of earthquakes is generally analyzed in terms of an incoherent series of events. But the study of wave propagation or lasing in such systems requires the consideration of coherent scattering. We consider the distribution of wave energy inside 1D random media in which the spacing between scatterers follow a Lévy $α$-stable distribution characterized by a power-law decay with exponent $α$. We show that the averages of the intensity and logarithmic intensity are given in terms of the average of the logarithm of transmission and the depth into the sample raised to the power $α$. Mapping the depth into the sample to the number of scattering elements yields intensity statistics that are identical to those found for Anderson localization in standard random media. This allows for the separation for the impacts of disorder distribution and wave coherence in random media.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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