Delocalisation transition in chains with correlated disorder

TL;DR

This paper demonstrates that long-range correlations in a 1D Anderson model can induce a transition from localized to extended states, effectively turning an insulator into a conductor due to correlation effects.

Contribution

It reveals that correlated disorder in 1D systems can cause an insulator-metal transition, a novel insight into disorder-induced conduction mechanisms.

Findings

Long-range correlations create extended states near the band center.

Correlated disorder can induce a transition from insulating to conducting behavior.

The system's conductive properties depend on the correlation structure of the disorder.

Abstract

We show that in the one-dimensional (1D) Anderson model long-range correlations within the sequence of on-site potentials may lead to a region of extended states in the vicinity of the band centre, i.e., to a correlation-induced insulator-metal transition. Thus, although still disordered, the 1D system can behave as a conductor.