Luminescence and absorption in short period superlattices

TL;DR

This paper develops analytical models for luminescence and absorption in short period semiconductor superlattices, linking theory with experimental absorption ratios and exploring excitonic pathways via THz responses.

Contribution

It introduces analytical approximations for superlattice luminescence and connects low density absorption with oscillator strength ratios, aiding systematic excitonic studies.

Findings

Analytical expressions match low density absorption ratios from Elliott formula.

Numerical results show bleaching of higher order bound states.

Potential for studying excitonic pathways via THz responses.

Abstract

This paper applies analytical approximations for the luminescence of short period semiconductor superlattices and analyses the low density regime, demonstrating that the theory clearly connects with low density absorption with ratios of oscillator strengths of bound and continuum states as expected from the Elliott formula. A numerical study illustrates in detail the bleaching of higher order bound state. The analytical expressions have potential for systematic studies of controlled excitonic pathways characterized by THz responses.