Comment on "Formation Mechanism and Low-Temperature Instability of Exciton Rings"

TL;DR

This paper critiques the use of the diffusive transport model in explaining exciton ring formation in GaAs/AlGaAs quantum wells, questioning its applicability based on previous studies and subsequent publications.

Contribution

It provides a detailed criticism of the diffusive transport model's applicability to exciton ring formation, challenging its validity in explaining experimental observations.

Findings

The diffusive transport model may not accurately describe exciton ring formation.

Previous publications have widely adopted the diffusive model without sufficient validation.

The critique suggests alternative mechanisms might better explain the phenomena.

Abstract

This is an extended version of the Comment that contains the criticism against an applicability of the diffusive transport model for the explanation of the ring-shaped spatial pattern formation in the exciton photoluminescence for the GaAs/AlGaAs double quantum wells [Phys. Rev. Lett. 92, 117404 (2004)]. The model has been used in other similar papers published in the PRL and the PRB afterwards.