Quantum-confined Stark shifts of charged exciton complexes in quantum dots

J J Finley, M Sabathil, P Vogl, G Abstreiter, R Oulton, A I Tartakovskii, D J Mowbray, M S Skolnick, S L Liew, A G Cullis, M Hopkinson

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

We probe the permanent excitonic dipole of neutral and positively charged excitons in individual In0.5Ga0.5As self-assembled quantum dots using Stark effect perturbation spectroscopy. A systematic reduction of the permanent excitonic dipole is found as excess holes are controllably added to individual dots containing a single exciton (X-0). Calculations of the few-body states show that this effect arises from a strong, Coulomb-mediated, spatial redistribution of the few-body wave function upon charging. By investigating correlations between the permanent dipole, polarizability, and the emission energy of X-0 for many dots, we also show that the strength of the In:Ga composition gradient is related to the absolute In content.

Original languageEnglish
Article number201308
Pages (from-to)-
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume70
Issue number20
DOIs
Publication statusPublished - Nov 2004

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