Phonon-Assisted Gain in a Semiconductor Double Quantum Dot Maser

TL;DR

This paper presents a microscopic model for a double quantum dot maser, highlighting the significant role of phonon-assisted processes in achieving gain and explaining recent experimental observations.

Contribution

The study introduces a detailed microscopic model that accounts for phonon-assisted gain mechanisms in a DQD maser, expanding understanding of its operational principles.

Findings

Phonon-assisted emission significantly contributes to the maser gain.

The model accurately fits recent experimental data.

Phonon sidebands dominate the overall gain leading to masing.

Abstract

We develop a microscopic model for the recently demonstrated double quantum dot (DQD) maser. In characterizing the gain of this device we find that, in addition to the direct stimulated emission of photons, there is a large contribution from the simultaneous emission of a photon and a phonon, i.e., the phonon sideband. We show that this phonon-assisted gain typically dominates the overall gain which leads to masing. Recent experimental data are well fit with our model.