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Insertion d'ions magnétiques dans les boîtes quantiques de semiconducteurs II-VI

Laurent Maingault 1, 2
2 NPSC - Nanophysique et Semiconducteurs
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/IRIG/PHELIQS
Abstract : Inserting magnetic impurities into semiconductor bulk materials leads to a ferromagnetic behavior. On the other hand, quantum dots confine carrier in all the space directions, allowing their individual control. This work deals with the insertion of a single magnetic impurity into a single II-VI semiconductor quantum dot. A straight-forward study of this interaction is performed with simple experimental set-ups.: a single spin can be detected and controlled with only optical means. This makes this system a candidate for a quantum-bit.
Molecular Beam Epitaxy sample growth first presented. Manganese segregation along the growth is used to reduce, and still control, Mn density to a very low value. Optical micro spectroscopy experiments assess this method. Then, a fine study of the interaction between the impurity and carrier in the quantum dot is achieved. Experimental spectra are analyzed with the help of a simple modelisation of the wavefunction of the carriers confined in the dot. Quantitative values of this interaction are shown, including the effect of the impurity position in the dot and its confined-induced reduction.
Finally, some possibilities to control this interaction are presented: its modification with the adding of carriers into the dot, and its increase with a better hole confinement.
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https://tel.archives-ouvertes.fr/tel-00186925
Contributor : Laurent Maingault <>
Submitted on : Friday, February 29, 2008 - 6:55:08 PM
Last modification on : Tuesday, November 24, 2020 - 4:00:04 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 3:34:46 PM

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  • HAL Id : tel-00186925, version 2

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Laurent Maingault. Insertion d'ions magnétiques dans les boîtes quantiques de semiconducteurs II-VI. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00186925v2⟩

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