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

doi:10.1103/PhysRevB.70.201308

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

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Abstract

We probe the permanent excitonic dipole of neutral and positively charged excitons in individual In_0.5Ga_0.5As 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 (X⁰). 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 X⁰ for many dots, we also show that the strength of the In:Ga composition gradient is related to the absolute In content.

Original language	English
Article number	201308
Pages (from-to)	201308-1-201308-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.70.201308
State	Published - Nov 2004

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Finley, J. J., Sabathil, M., Vogl, P., Abstreiter, G., Oulton, R., Tartakovskii, A. I., Mowbray, D. J., Skolnick, M. S., Liew, S. L., Cullis, A. G., & Hopkinson, M. (2004). Quantum-confined Stark shifts of charged exciton complexes in quantum dots. Physical Review B - Condensed Matter and Materials Physics, 70(20), 201308-1-201308-4. Article 201308. https://doi.org/10.1103/PhysRevB.70.201308

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title = "Quantum-confined Stark shifts of charged exciton complexes in quantum dots",

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 (X0). 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 X0 for many dots, we also show that the strength of the In:Ga composition gradient is related to the absolute In content.",

author = "Finley, {J. J.} and M. Sabathil and P. Vogl and G. Abstreiter and R. Oulton and Tartakovskii, {A. I.} and Mowbray, {D. J.} and Skolnick, {M. S.} and Liew, {S. L.} and Cullis, {A. G.} and M. Hopkinson",

year = "2004",

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doi = "10.1103/PhysRevB.70.201308",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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Finley, JJ, Sabathil, M, Vogl, P, Abstreiter, G, Oulton, R, Tartakovskii, AI, Mowbray, DJ, Skolnick, MS, Liew, SL, Cullis, AG & Hopkinson, M 2004, 'Quantum-confined Stark shifts of charged exciton complexes in quantum dots', Physical Review B - Condensed Matter and Materials Physics, vol. 70, no. 20, 201308, pp. 201308-1-201308-4. https://doi.org/10.1103/PhysRevB.70.201308

TY - JOUR

T1 - Quantum-confined Stark shifts of charged exciton complexes in quantum dots

AU - Finley, J. J.

AU - Sabathil, M.

AU - Vogl, P.

AU - Abstreiter, G.

AU - Oulton, R.

AU - Tartakovskii, A. I.

AU - Mowbray, D. J.

AU - Skolnick, M. S.

AU - Liew, S. L.

AU - Cullis, A. G.

AU - Hopkinson, M.

PY - 2004/11

Y1 - 2004/11

N2 - 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 (X0). 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 X0 for many dots, we also show that the strength of the In:Ga composition gradient is related to the absolute In content.

AB - 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 (X0). 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 X0 for many dots, we also show that the strength of the In:Ga composition gradient is related to the absolute In content.

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U2 - 10.1103/PhysRevB.70.201308

DO - 10.1103/PhysRevB.70.201308

M3 - Article

AN - SCOPUS:37649027864

SN - 0163-1829

VL - 70

SP - 201308-1-201308-4

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 20

M1 - 201308

ER -

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

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