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arXiv 1406.6594cond-mat.dis-nncond-mat.mes-hall
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$N$强耦合链中依赖宇称的局域化

Parity-dependent localization in $N$ strongly coupled chains

Dietmar Weinmann, S. N. Evangelou

摘要:

研究了具有链间耦合$t$的准一维$N$无序链系统中零能波函数的安德森局域化。当$t$小于纵向跳跃的$t'=1$时,局部化变得比1D无序链($t=0$)弱,并且当$t\gg t'$时,局部化通常变得强得多。并非所有$N$都是如此。我们发现“免疫力”强本地化开放(周期性)的横向边界条件时,$N$是奇数(4的倍数),本地化是弱于$t=0$,而不敏感的$t$时,$t \gg t'$。通过对$t'/t$的微扰处理解释了$N$的特殊依赖性和临界标度性,并给出了对应于弱无序有效链的结果.我们的研究结果可能是相关的实验研究,在光子波导阵列的本地化。

英文摘要:

Anderson localization of wave-functions at zero energy in quasi-1D systems of $N$ disordered chains with inter-chain coupling $t$ is examined. Localization becomes weaker than for the 1D disordered chain ($t=0$) when $t$ is smaller than the longitudinal hopping $t'=1$, and localization becomes usually much stronger when $t\gg t'$. This is not so for all $N$. We find "immunity" to strong localization for open (periodic) lateral boundary conditions when $N$ is odd (a multiple of four), with localization that is weaker than for $t=0$ and rather insensitive to $t$ when $t \gg t'$. The peculiar $N$-dependence and a critical scaling with $N$ is explained by a perturbative treatment in $t'/t$, and the correspondence to a weakly disordered effective chain is shown. Our results could be relevant for experimental studies of localization in photonic waveguide arrays.

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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