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 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 language	English
Article number	201308
Pages (from-to)	-
Number of pages	4
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	70
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.70.201308
Publication status	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]. https://doi.org/10.1103/PhysRevB.70.201308

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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.",

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",

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doi = "10.1103/PhysRevB.70.201308",

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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 (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.

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 (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.

U2 - 10.1103/PhysRevB.70.201308

DO - 10.1103/PhysRevB.70.201308

M3 - Article (Academic Journal)

VL - 70

SP - -

JO - Physical Review B: Condensed Matter and Materials Physics

JF - Physical Review B: Condensed Matter and Materials Physics

SN - 1098-0121

IS - 20

M1 - 201308

ER -

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

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