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<dc:title xml:lang="en">Tailoring the luminescence of atomically-thin semiconductors with sub-nanometer resolution</dc:title>
<dcterms:alternative xml:lang="fr">Contrôle de la luminescence de semi-conducteurs bidimensionnels à l’échelle sub-nanométrique</dcterms:alternative>
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<dc:subject xml:lang="fr">Optoélectronique</dc:subject>
<dc:subject xml:lang="fr">STML</dc:subject>
<dc:subject xml:lang="fr">Matériaux 2D</dc:subject>
<dc:subject xml:lang="fr">Graphène</dc:subject>
<dc:subject xml:lang="fr">Dichalcogénures de métaux de transition</dc:subject>
<dc:subject xml:lang="fr">Hétérostructures de van der Waals</dc:subject>
<dc:subject xml:lang="fr">Transfert de charge</dc:subject>
<dc:subject xml:lang="fr">Transfert d’énergie</dc:subject>
<dc:subject xml:lang="en">Photoluminescence spectroscopy</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, nous présentons une étude des propriétés optiques des hétérostructures de van der Waals avec une résolution sub-nanométrique. Pour y parvenir, nous utilisons une approche unique combinant des spectroscopies optiques résolues spatialement et temporellement. Nous utilisons ces techniques pour caractériser des hétérsotructures de van der Waals composées d’une monocouche de dichalcogénure de métaux de transition (TMD) coupleé à une ou plusieurs couches du graphène. Tout d’abord, nous montrons comment nous fabriquons ces hétérostructures. Ensuite, nous caractérisons en profondeur le couplage entre les couches de ces hétérostructures à basse température. Nous étudions ensuite la luminescence induite par une pointe de microscope à effet tunnel (STML) afin de sonder l’effet de l’environnement nanoscopique sur les propriétés optiques de nos échantillons. Ce travail met en évidence la richesse de la physique des hétérostructures de van der Waals et ouvre la voie à des études où des matériaux 2D peuvent être sondés à l’échelle atomique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this thesis, we present an investigation of the optical properties of van der Waals heterostructures with sub-nm resolution. To achieve this, we use a unique approach combining time- and spatially-resolved optical spectroscopies together with STM-induced luminescence (STML). We use these techniques to characterize van der Waals heterostructures made from a monolayer transition metal dichalcogenides (TMDs) coupled to graphene mono- or few-layers. First, we show how we fabricate these heterostructures. Then, we thoroughly characterize the interlayer coupling in various heterostructures at low temperatures. We then use STML to investigate the effect of the nanoscopic landscape on the optical properties of TMD-based heterostructures. This work sheds light on the rich physics in van der Waals heterostructures and paves the way for investigations where 2D-materials can be probed at the nanoscale.</dcterms:abstract>
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