论文标题
在本地操纵无序肿块的远程影响
Long-range influence of manipulating disordered-insulators locally
论文作者
论文摘要
波形的定位可以说是量子系统中疾病最熟悉的效果。最近有人争辩[[V. Khemani，R。Nandkishore和S. L. Sondhi，《自然物理学》，11，560（2015）]，与幼稚的期望相反，在无序培养基中对局部位置的操纵可能会在长度尺度上产生远比本地化长度$ξ$大的长度尺度的干扰。在这里，我们报告了电子传输实验中这种非局部现象的观察。作为波浪性质，这种效果的可见性取决于量子含量及其空间尺度，最终可能会受到无序绝缘体的相位连接长度的限制。在安德森构造阶段，量子相干性的证据可以是从磁性测量值中获得的，但是这些测量主要在薄膜中有用。在这项工作中使用的技术提供了一种经验方法，即使在相对较厚的样本中，也可以测量安德森 - 构造者的基本方面。
Localization of wavefunctions is arguably the most familiar effect of disorder in quantum systems. It has been recently argued [[V. Khemani, R. Nandkishore, and S. L. Sondhi, Nature Physics, 11, 560 (2015)] that, contrary to naive expectation, manipulation of a localized-site in the disordered medium may produce a disturbance over a length-scale much larger than the localization-length $ξ$. Here we report on the observation of this nonlocal phenomenon in electronic transport experiment. Being a wave property, visibility of this effect hinges upon quantum-coherence, and its spatial-scale may be ultimately limited by the phase-coherent length of the disordered insulator. Evidence for quantum coherence in the Anderson-insulating phase may be obtained from magneto-resistance measurements which however are useful mainly in thin-films. The technique used in this work offers an empirical method to measure this fundamental aspect of Anderson-insulators even in relatively thick samples.
