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arXiv 2007.10648cond-mat.dis-nn
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三维无序原子晶体中光的局域化

Localization of light in a three-dimensional disordered crystal of atoms

S. E. Skipetrov

摘要:

我们证明了原子位置的弱无序引入了空间局域光学模式在一个密集的三维系综的不动的两个层次的原子排列在金刚石晶格和电磁场耦合。局域模的频率集中在未扰动晶格的带边附近。对无电导的电导图进行的有限尺寸标度分析揭示了两个迁移率边缘,并得到了局域化长度临界指数的估计值$ν= 0.8$ --1.1。当无序变得太强时,局域模消失,系统开始类似于一个完全无序的系统,其中所有的模都被扩展。

英文摘要:

We demonstrate that a weak disorder in atomic positions introduces spatially localized optical modes in a dense three-dimensional ensemble of immobile two-level atoms arranged in a diamond lattice and coupled by the electromagnetic field. The frequencies of the localized modes concentrate near band edges of the unperturbed lattice. Finite-size scaling analysis of the percentiles of Thouless conductance reveals two mobility edges and yields an estimation $ν= 0.8$--1.1 for the critical exponent of the localization length. The localized modes disappear when the disorder becomes too strong and the system starts to resemble a fully disordered one where all modes are extended.

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