Optical Orientation of Trions in Charge-Tunable InAs/GaAs Quantum Dots

• Authors: S. Laurent , B. Eble , O. Krebs , A. Lemaître , B. Urbaszek , X. Marie , T. Amand , P. Voisin
• Languages of publication: EN

Abstracts

EN

We report on optical orientation of excitons and trions (singly charged exciton) in individual charge-tunable self-assembled InAs/GaAs quantum dots. When the number of electrons varies from 0 to 2, the trion photoluminescence under quasi-resonant excitation gets progressively polarized from zero to ≈100%. We discuss this behavior as the efficient quenching of exciton spin quantum beats in anisotropic quantum dots due to the trion formation. This result indicates a long hole-spin relaxation time larger than the radiative lifetime, confirmed by time-resolved photoluminescence measurements carried out on a quantum dots ensemble.

Keywords

EN

71.70.-d; 72.25.Fe; 73.21.La; 78.47.+p

Discipline

• 72.25.Fe: Optical creation of spin polarized carriers
• 71.70.-d: Level splitting and interactions(see also 73.20.-r Surface and interface electron states; 75.30.Et Exchange and superexchange interactions)
• 73.21.La: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 2
• Pages: 185-192

Dates

published

2004-08

received

2004-28-15

Contributors

author

S. Laurent

• Laboratoire de Photonique et Nanostructures-CNRS, Route de Nozay, 91460 Marcoussis, France

author

B. Eble

• Laboratoire de Photonique et Nanostructures-CNRS, Route de Nozay, 91460 Marcoussis, France

author

O. Krebs

• Laboratoire de Photonique et Nanostructures-CNRS, Route de Nozay, 91460 Marcoussis, France

author

A. Lemaître

• Laboratoire de Photonique et Nanostructures-CNRS, Route de Nozay, 91460 Marcoussis, France

author

B. Urbaszek

• Laboratoire de Magnétisme, Nanophysique et Optoélectronique, INSA, 135 Avenue de Rangueil, 31077 Toulouse Cedex, France

author

X. Marie

• Laboratoire de Magnétisme, Nanophysique et Optoélectronique, INSA, 135 Avenue de Rangueil, 31077 Toulouse Cedex, France

author

T. Amand

• Laboratoire de Magnétisme, Nanophysique et Optoélectronique, INSA, 135 Avenue de Rangueil, 31077 Toulouse Cedex, France

author

P. Voisin

• Laboratoire de Photonique et Nanostructures-CNRS, Route de Nozay, 91460 Marcoussis, France

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Identifiers

DOI

10.12693/APhysPolA.106.185