Drift-diffusion model of the fragmentation of the external ring structure in the photoluminescence pattern emitted by indirect excitons in coupled quantum wells

Wilkes, Joe ORCID: https://orcid.org/0000-0001-6776-9162, Muljarov, Egor A. ORCID: https://orcid.org/0000-0002-2878-4148 and Ivanov, Alexei 2012. Drift-diffusion model of the fragmentation of the external ring structure in the photoluminescence pattern emitted by indirect excitons in coupled quantum wells. Physical Review Letters 109 (18) , 187402. 10.1103/PhysRevLett.109.187402

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Abstract

Under optical excitation, coupled quantum wells are known to reveal fascinating features in the photoluminescence pattern originating from dipole orientated indirect excitons. The appearance of an external ring has been attributed to macroscopic charge separation in the quantum well plane. We present a classical model of nonlinear diffusion to account for the observed fragmentation of the external ring into a periodic array of islands. The model incorporates the Coulomb interactions between electrons, holes, and indirect excitons. At low temperatures, these interactions lead to pattern formation similar to the experimentally observed ring fragmentation. The fragmentation is found to persist to temperatures above the quantum degeneracy temperature of indirect excitons.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	0031-9007
Date of First Compliant Deposit:	30 March 2016
Last Modified:	23 May 2023 21:18
URI:	https://orca.cardiff.ac.uk/id/eprint/45562

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