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Détection de spins individuels dans les boîtes quantiques magnétiques

Abstract : Using a micro-spectroscopy setup, we studied II-VI semiconductor quantum dots containing a single magnetic impurity (Mn atom). The emission of these systems is controlled by the interactions between the confined carriers and the Mn spin. The different parameters controlling these interactions were determined by magneto-optical experiments. By analysing the emission spectrum of some of these magnetic quantum dots, we can detect directly the spin state of the magnetic impurity. The detection conditions are strongly influenced by the dot shape anisotropy or an inhomogeneous distribution of strains in the local environment of the dot. The effects of these phenomena were studied in details. We also studied the magneto-optical properties of the different charged states of magnetic quantum dots. This shows the possibility to control electrically or optically the magnetic anisotropy of nanoscopic magnetic systems. Finally, we began to study the dynamics of these systems. Single spin temporal fluctuations were pointed out by analysing the statistics of photons emitted by single magnetic quantum dots.
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https://tel.archives-ouvertes.fr/tel-00202472
Contributor : Yoan Léger <>
Submitted on : Monday, January 7, 2008 - 10:21:53 AM
Last modification on : Thursday, November 19, 2020 - 1:00:32 PM
Long-term archiving on: : Tuesday, April 13, 2010 - 4:24:41 PM

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  • HAL Id : tel-00202472, version 1

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Yoan Léger. Détection de spins individuels dans les boîtes quantiques magnétiques. Physique Atomique [physics.atom-ph]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00202472⟩

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