Enhanced Transmission Due to Disorder

TL;DR

This paper investigates how weak disorder in a one-dimensional periodic system can enhance transmission at certain frequencies, revealing a universal property and complex behavior at strong disorder levels.

Contribution

It demonstrates that weak disorder can increase transmission in periodic systems and shows this effect is universal across different types of randomness.

Findings

Transmission increases with weak disorder in band gaps.

Universal behavior independent of fluctuation type.

Non-monotonic transmission behavior at strong disorder.

Abstract

The transmissivity of a one-dimensional random system that is periodic on average is studied. It is shown that the transmission coefficient for frequencies corresponding to a gap in the band structure of the average periodic system increases with increasing disorder while the disorder is weak enough. This property is shown to be universal, independent of the type of fluctuations causing the randomness. In the case of strong disorder the transmission coefficient for frequencies in allowed bands is found to be a non monotonic function of the strength of the disorder. An explanation for the latter behavior is provided.