Propriétés des boites quantiques GaAs/AlGaAs obtenues par remplissage des nanotrous

Abstract : The goal of this thesis work was to characterise quantum dots obtained by a novel growth method. We used microphotoluminescence techniques to study multiple properties of these dots. We have evaluated main contributions to light-heavy hole valence band mixing. Contrary to self-assembled dots, we find a more homogeneous distribution of the mixing parameter, which can be explained by the absence of mechanical tension due to lattice mismatch. We have also measured magneto-optical parameters such as electron and hole g-factors, diamagnetic shift, fine structure splitting for bright and dark states. These results allowed us to estimate geometric parameters of dots, making a point on the growth quality. Polarisation studies on the dark states have revealed a result different from previous theoretical predictions. We have used a recently presented model to explain our findings. The last part of this work presents results on quantum dots embedded in an n-i Schottky structure. We have measured binding energies of positive and negative trions, to make a connection with previous results, to then study double quantum dot system. We have observed an anticrossing of hole S states, which is in agreement with our estimations based on sample parameters.
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Science des matériaux [cond-mat.mtrl-sci]. Université Pierre et Marie Curie - Paris VI, 2017. Français. 〈NNT : 2017PA066028〉
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Andrey Pankratov. Propriétés des boites quantiques GaAs/AlGaAs obtenues par remplissage des nanotrous. Science des matériaux [cond-mat.mtrl-sci]. Université Pierre et Marie Curie - Paris VI, 2017. Français. 〈NNT : 2017PA066028〉. 〈tel-01589000〉

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