Radiative lifetimes and linewidth broadening of single InAs quantum dots in an AlxGa(1-x)As matrix

S. C. M. Grijseels; J. van Bree; P. M. Koenraad; A. A. Toropov; G. V. Klimko; S. V. Ivanov; C. E. Pryor; A. Yu Silov

doi:10.1016/j.jlumin.2016.03.005

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Radiative lifetimes and linewidth broadening of single InAs quantum dots in an AlxGa(1-x)As matrix

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Radiative lifetimes and linewidth broadening of single InAs quantum dots in an AlxGa(1-x)As matrix

S. C. M. Grijseels, J. van Bree, P. M. Koenraad, A. A. Toropov, G. V. Klimko, S. V. Ivanov, C. E. Pryor and A. Yu Silov

Journal of luminescence, Vol.176, pp.95-99

08/01/2016

DOI: 10.1016/j.jlumin.2016.03.005

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https://research.tue.nl/en/publications/60624f9f-a6cf-4d07-9228-a6fb42c689a7View

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Abstract

We investigate the linewidths and radiative lifetimes of single InAs quantum dots embedded in the ternary matrix AlxGa(1-x)As as a function of aluminum composition. For an increasing aluminum content, we find that the average of the measured linewidths of individual transitions increases. Furthermore, we find that the distribution of the measured linewidths broadens. We infer that the linewidth broadening is the result of spectral wandering caused by inhomogeneities and local defects in the surrounding Al, Ga(1-x)As matrix. Local charging and de-charging of defects polarize quantum dots in their vicinity thereby shifting the energy states of the exciton transition in time through the quantum confined Stark effect. The intrinsic radiative lifetimes of numerous quantum dots were determined. We suggest that the observed variation in radiative lifetime at a given photon energy is explained by the influence of an in plane electric field on the oscillator strength of the electron-hole pair. (C) 2016 Elsevier B.V. All rights reserved.

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Title: Subtitle: Radiative lifetimes and linewidth broadening of single InAs quantum dots in an AlxGa(1-x)As matrix
Creators: S. C. M. Grijseels - Eindhoven University of Technology
J. van Bree - Eindhoven University of Technology
P. M. Koenraad - Eindhoven University of Technology
A. A. Toropov - Ioffe Institute
G. V. Klimko - Ioffe Institute
S. V. Ivanov - Ioffe Institute
C. E. Pryor - University of Iowa
A. Yu Silov - Eindhoven University of Technology
Resource Type: Journal article
Publication Details: Journal of luminescence, Vol.176, pp.95-99
DOI: 10.1016/j.jlumin.2016.03.005
ISSN: 0022-2313
eISSN: 1872-7883
Publisher: Elsevier
Number of pages: 5
Grant note: 14-22-00107 / Russian Science Foundation, RSF; Russian Science Foundation (RSF) 14-42-00015 / RSF; Russian Science Foundation (RSF) 14-22-00107 / Russian Science Foundation; Russian Science Foundation (RSF)
Language: English
Date published: 08/01/2016
Academic Unit: Physics and Astronomy
Record Identifier: 9984429028902771

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