Phonon effects on the radiative recombination of excitons in double quantum dots

TL;DR

This paper investigates how phonon interactions influence the radiative recombination and coherence properties of excitons in double quantum dots, revealing temperature-dependent effects and conditions for extended coherence.

Contribution

It introduces a theoretical analysis of phonon-induced effects on exciton recombination and coherence transfer in double quantum dots, highlighting conditions for extended polarization lifetime.

Findings

Phonon interactions cause temperature-sensitive modifications to exciton emission.

Resonance conditions enable coherent transfer and extended lifetime of excitonic polarization.

The study assesses the robustness of coherence transfer against phonon-induced decoherence.

Abstract

We study theoretically the radiative recombination of excitons in double quantum dots in the presence of carrier-phonon coupling. We show that the phonon-induced pure dephasing effects and transitions between the exciton states strongly modify the spontaneous emission process and make it sensitive to temperature, which may lead to non-monotonic temperature dependence of the time-resolved luminescence. We show also that under specific resonance conditions the biexcitonic interband polarization can be coherently transferred to the excitonic one, leading to an extended life time of the total coherent polarization, which is reflected in the nonlinear optical spectrum of the system. We study the stability of this effect against phonon-induced decoherence.