Delocalization induced by low-frequency driving in disordered superlattices

TL;DR

This paper investigates how low-frequency ac driving fields can induce delocalization in disordered semiconductor superlattices, revealing that the localization length can be maximized by tuning the amplitude and frequency of the driving field.

Contribution

It demonstrates the effect of low-frequency driving on electron localization in disordered superlattices and identifies optimal conditions for maximal delocalization.

Findings

Localization length increases with decreasing driving frequency.

An optimal driving amplitude maximizes localization length.

Maximum localization length scales inversely with driving frequency.

Abstract

We study the localization properties of disordered semiconductor superlattices driven by ac-fields. The localization length of the electrons in the superlattice increases when the frequency of the driving field is smaller than the miniband width. We show that there is an optimal value of the amplitude of the driving field for which the localization length of the system is maximal. This maximum localization length increases with the inverse of the driving frequency.