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<dc:title xml:lang="en">Development of new embedding techniques for strongly correlated electrons : from in-principle-exact formulations to practical approximations.</dc:title>
<dcterms:alternative xml:lang="fr">Nouvelles techniques d'embedding pour les électrons fortement corrélés : de la formulation exacte au développement d'approximations</dcterms:alternative>
<dc:subject xml:lang="fr">Électrons fortement corrélés</dc:subject>
<dc:subject xml:lang="fr">Théorie de la fonction d’onde</dc:subject>
<dc:subject xml:lang="fr">Théorie de la fonctionnelle de la densité</dc:subject>
<dc:subject xml:lang="fr">Méthode d’embedding</dc:subject>
<dc:subject xml:lang="fr">Site-occupation embedding theory</dc:subject>
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<dc:subject xml:lang="en">Strongly correlated electrons</dc:subject>
<dc:subject xml:lang="en">Wavefunction theory</dc:subject>
<dc:subject xml:lang="en">Density functional theory</dc:subject>
<dc:subject xml:lang="en">Embedding methods</dc:subject>
<dc:subject xml:lang="en">Site-occupation embedding theory</dc:subject>
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<tef:elementdEntree autoriteExterne="027820599" autoriteSource="Sudoc">Théorie du mouvement ondulatoire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="03142628X" autoriteSource="Sudoc">Théorie de la fonctionnelle de densité</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031426107" autoriteSource="Sudoc">Modèle de Hubbard</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Cette thèse traite du développement et de l’implémentation de nouvelles méthodes visant à décrire la corrélation électronique forte dans les molécules et les solides. Après avoir introduit l’état de l’art des méthodes utilisées en chimie quantique et en physique de la matière condensée, une nouvelle méthode hybride combinant théorie de la fonction d’onde et théorie de la fonctionnelle de la densité (DFT) est présentée et s’intitule “site-occupation embedding theory” (SOET). Celle-ci est appliquée au modèle de Hubbard à une dimension. Ensuite, le problème du gap fondamental est revisité en DFT pour les ensembles, où la dérivée discontinue est réécrite comme une fonctionnelle de la densité de l'état fondamental. Enfin, une extension à la chimie quantique est proposée, basée sur une fonction d’onde de séniorité zéro complémentée par une fonctionnelle de la matrice densité, et exprimée dans la base des orbitales naturelles.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The thesis deals with the development and implementation of new methods for the description of strong electron correlation effects in molecules and solids. After introducing the state of the art in quantum chemistry and in condensed matter physics, a new hybrid method so-called ``site-occupation embedding theory'' (SOET) is presented and is based on the merging of wavefunction theory and density functional theory (DFT). Different formulations of this theory are described and applied to the one-dimensional Hubbard model. In addition, a novel ensemble density functional theory approach has been derived to extract the fundamental gap exactly. In the latter approach, the infamous derivative discontinuity is reformulated as a derivative of a weight-dependent exchange-correlation functional. Finally, a quantum chemical extension of SOET is proposed and based on a seniority-zero wavefunction, completed by a functional of the density matrix and expressed in the natural orbital basis.</dcterms:abstract>
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