Tuning of dynamic localization in coupled minibands: signatures of a field induced insulator-metal transition

TL;DR

This paper investigates how an AC field influences coupled mini-bands, revealing two distinct localization regimes and a field-induced transition resembling an insulator-metal change, characterized by a breakdown in quasi-energy maps.

Contribution

It provides a non-perturbative analysis of dynamic localization in coupled mini-bands across a wide frequency range, identifying signatures of a field-induced insulator-metal transition.

Findings

Two dynamic localization regimes separated by a breakdown region

Identification of a field-induced insulator-metal transition

Suppression of a Peierls-like instability by the AC field

Abstract

We follow the evolution of dressed coupled mini-bands as a function of an AC field intensity, non perturbatively, for a wide field frequency range. High and low frequency limits are characterized by two different dynamic localization regimes, clearly separated by a breakdown region in a quasi-energy map. Signatures of a insulator-metal like transition by means of a field induced suppression of a Peierls-like instability are identified.