Dicke Superradiance in a magnetoplasma

TL;DR

This paper theoretically predicts superradiance phenomena in a magnetized semiconductor heterostructure, including a distinctive emission peak and oscillations, observable on ultrafast timescales under strong magnetic fields.

Contribution

It introduces a theoretical model predicting superradiance effects, including a Dicke-peak and novel oscillations, in magnetoplasma systems under strong magnetic fields.

Findings

Predicted a strong emission peak ('Dicke-peak') in superradiance.

Identified a magnetic field dependence of the superradiance features.

Discovered oscillations with frequency proportional to the square root of pumping rate.

Abstract

We present theoretical results for superradiance, i.e. the collective coherent decay of a radiating system, in a semiconductor heterostructure under a strong quantizing magnetic field. We predict a strong peak (`Dicke-peak') in the emission intensity as a function of time, which should be observable after a short initial excitation of electrons into the conduction band. This peak has a characteristic dependence on the magnetic field and should be observable on sub-picosecond time scales. Furthermore, pumping of electrons and holes into the systems at a rate T leads to a novel kind of oscillations with frequency $\sim \sqrt{T}$ in the limit of the lowest Landau level.