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Coherent spectroscopy of optically gated charged single InGaAs quantum dots

Coherent spectroscopy of optically gated charged single InGaAs quantum dots
Coherent spectroscopy of optically gated charged single InGaAs quantum dots
The excited states of neutral and charged single InGaAs/GaAs quantum dots are studied using a confocal microspectroscopy technique. Because of their different Coulomb energy shifts, the charged and neutral states of the same quantum dot can be selectively excited. The charge of the quantum dot is controlled by a photo-depletion mechanism. Time-resolved coherent spectroscopy shows that the dephasing time of the excited states is longer when the quantum dot is charged. Rabi oscillation of the excited state of a singly charged quantum dot is demonstrated.
0031-9007
257402-[4pp]
Besombes, L.
ba3491f7-80f2-47a6-af08-1b75fec26856
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Motohisa, J.
fff85b3c-f739-4cb4-9204-184d2d5ebb63
Besombes, L.
ba3491f7-80f2-47a6-af08-1b75fec26856
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Motohisa, J.
fff85b3c-f739-4cb4-9204-184d2d5ebb63

Besombes, L., Baumberg, J.J. and Motohisa, J. (2003) Coherent spectroscopy of optically gated charged single InGaAs quantum dots. Physical Review Letters, 90 (25), 257402-[4pp]. (doi:10.1103/PhysRevLett.90.257402).

Record type: Article

Abstract

The excited states of neutral and charged single InGaAs/GaAs quantum dots are studied using a confocal microspectroscopy technique. Because of their different Coulomb energy shifts, the charged and neutral states of the same quantum dot can be selectively excited. The charge of the quantum dot is controlled by a photo-depletion mechanism. Time-resolved coherent spectroscopy shows that the dephasing time of the excited states is longer when the quantum dot is charged. Rabi oscillation of the excited state of a singly charged quantum dot is demonstrated.

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Published date: 2003
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 259963
URI: http://eprints.soton.ac.uk/id/eprint/259963
ISSN: 0031-9007
PURE UUID: 8c3412ed-29b8-4224-a7f9-e121a60f70c6

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Date deposited: 21 Oct 2004
Last modified: 11 Apr 2022 17:58

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Contributors

Author: L. Besombes
Author: J.J. Baumberg
Author: J. Motohisa

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