Localization-Delocalization Transition in the Random Dimer Model

TL;DR

This paper explores a method to induce a localization-delocalization transition in a one-dimensional disordered system using ultracold atomic mixtures, avoiding the need to alter impurity correlations.

Contribution

It introduces a novel approach to control the transition via external tuning of interspecies interactions in ultracold atoms.

Findings

Transition can be crossed by tuning interactions without modifying correlations

Ultracold atomic mixtures serve as a versatile platform for studying localization phenomena

Potential applications in quantum simulation of disordered systems

Abstract

The random-dimer model is probably the most popular model for a one-dimensional disordered system where correlations are responsible for delocalization of the wave functions. This is the primary model used to justify the insulator-metal transition in conducting polymers and in DNA. However, for such systems, the localization-delocalization regimes have only been observed by deeply modifying the system itself, including the correlation function of the disordered potential. In this article, we propose to use an ultracold atomic mixture to cross the transition simply by externally tuning the interspecies interactions, and without modifying the impurity correlations.