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

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.

4 pages, 4 figures ps & eps, Revtex, changed content