Electron Bloch Oscillations and Electromagnetic Transparency of Semiconductor Superlattices in Multi-Frequency Electric Fields

TL;DR

This paper investigates how multi-frequency electric fields induce electromagnetic transparency in semiconductor superlattices, linking it to electron localization and analyzing stability and collapse mechanisms through numerical simulations.

Contribution

It introduces a detailed analysis of electromagnetic transparency phenomena in superlattices under complex electric fields, highlighting self-induced transparency and dynamic localization effects.

Findings

Identification of conditions for electromagnetic transparency

Numerical demonstration of transparency collapse and stabilization

Correlation between transparency and electron localization

Abstract

We examine phenomenon of electromagnetic transparency in semiconductor superlattices (having various miniband dispersion laws) in the presence of multi-frequency periodic and non-periodic electric fields. Effects of induced transparency and spontaneous generation of static fields are discussed. We paid a special attention on a self-induced electromagnetic transparency and its correlation to dynamic electron localization. Processes and mechanisms of the transparency formation, collapse, and stabilization in the presence of external fields are studied. In particular, we present the numerical results of the time evolution of the superlattice current in an external biharmonic field showing main channels of transparency collapse and its partial stabilization in the case of low electron density superlattices.