Collective fluorescence and decoherence of a few nearly identical quantum dots

TL;DR

This paper investigates how collective fluorescence and decoherence phenomena manifest in closely spaced quantum dots with slight energy mismatches, revealing complex decay behaviors and stability of subdecoherent states.

Contribution

It provides new insights into the collective optical behavior of nearly identical quantum dots, including superradiance and decoherence dynamics with realistic energy mismatches.

Findings

Superradiant state exhibits two-rate decay due to energy mismatch.

Collective fluorescence builds up despite small energy differences.

Subdecoherent states can remain stable in non-identical quantum systems.

Abstract

We study the collective interaction of excitons in closely spaced artificial molecules and arrays of nearly identical quantum dots with the electromagnetic modes. We discuss how collective fluorescence builds up in the presence of a small mismatch of the transition energy. We show that a superradiant state of a single exciton in a molecule of two dots with realistic energy mismatch undergoes a two-rate decay. We analyze also the stability of subdecoherent states for non-identical systems.