Electron Bloch oscillations and electromagnetic transparency of semiconductor superlattices in multi-frequency electric fields

Abstract

We examine phenomenon of electromagnetic transparency in semiconductor superlattices (having various miniband dispersion laws) in the presence of multi-frequency periodic and nonperiodic 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.

Theory of relaxation for spontaneous emission of Bloch oscillation radiation2S3 glass

“…Recent progress in nanotechnology makes it possible to fabricate various kinds of SLs that are different from the usual periodically layered QW structures based on III-V compounds. [3][4][5] These examples include quantum-dot SLs of varying dimensionality (1D, 2D, and 3D SLs) [42,43], graphene-based SLs [44][45][46], and natural SLs in SiC crystals [47], which, in particular, have been investigated for the practical realization of a Blochoscillation terahertz generator [48][49][50][51][52].…”