Collapse of electron band gaps in periodical structures dressed by a high-frequency field

TL;DR

This paper theoretically shows that a high-frequency electromagnetic field can suppress Bragg reflection in periodic structures, leading to the collapse of electron band gaps, applicable to both natural and artificial materials.

Contribution

It introduces a quantum phenomenon where strong high-frequency fields collapse electron band gaps in various periodic structures, expanding understanding of electron dynamics under electromagnetic influence.

Findings

High-frequency fields suppress Bragg reflection

Electron band gaps can be collapsed in various structures

Applicable to both natural and artificial materials

Abstract

It is demonstrated theoretically that the strong interaction between electrons in periodical structures and a high-frequency electromagnetic field suppresses the Bragg reflection of the electrons. As a result, the band gaps in electron energy spectra of the structures (the Bragg gaps) are collapsed. This quantum phenomenon can take place in various periodical structures, including both natural crystalline solids and artificial superlattices.