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<dc:title xml:lang="en">Chern classes of fractional quantum hall bundles</dc:title>
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<dc:subject xml:lang="fr">Effet Hall quantique fractionnaire</dc:subject>
<dc:subject xml:lang="fr">Théorème de Grothendieck--Riemann--Roch</dc:subject>
<dc:subject xml:lang="fr">Théorème de Wick</dc:subject>
<dc:subject xml:lang="fr">Électrons fortement corrélés</dc:subject>
<dc:subject xml:lang="fr">Diagonales dans les puissances symétriques de courbes</dc:subject>
<dc:subject xml:lang="en">Fractional quantum Hall effect</dc:subject>
<dc:subject xml:lang="en">Grothendieck--Riemann--Roch theorem</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse développe l'étude algébro-géométrique des fonctions d'onde apparaissant dans l'effet Hall quantique fractionnaire sur les surfaces de Riemann fermées. La première partie porte sur les généralisations multicouches des états de Laughlin. Ces états forment un fibré vectoriel au-dessus de la jacobienne de la surface, et nous calculons son caractère de Chern complet à l'aide du théorème de Grothendieck--Riemann--Roch, de l'intégration de Berezin et de la formule de Wick pour les algèbres extérieures. Cela nous permet d'obtenir la dégénérescence des états multicouches et la conductance de Hall associée, démontrant ainsi deux conjectures de Keski-Vakkuri et Wen. Nous caractérisons par ailleurs les configurations à nombre maximal de particules et identifions la shift formula, une relation entre les paramètres du problème telle que, lorsqu'elle est satisfaite, le caractère de Chern est compatible avec la platitude projective du fibré.La seconde partie porte sur les états de Laughlin avec quasi-trous. Ces états forment un fibré vectoriel au-dessus de l'espace de modules des configurations de quasi-trous. Nous calculons son caractère de Chern, qui donne, terme à terme, la décomposition prédite de la phase de Berry lors de l'échange de quasi-trous en une contribution extensive de type Aharonov--Bohm et une contribution provenant de la statistique fractionnaire.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis develops the algebro-geometric study of wave functions arising in the fractional quantum Hall effect on closed Riemann surfaces. The first part concerns multilayer generalizations of Laughlin states. These states form a vector bundle over the Jacobian of the surface, and we compute its full Chern character using the Grothendieck--Riemann--Roch theorem, Berezin integration, and Wick's formula for exterior algebras. The rank gives the ground-state degeneracy, while the first Chern class divided by the rank gives the Hall conductance, proving two conjectures of Keski-Vakkuri and Wen. We further characterize the maximal particle-number configurations and identify the shift formula, a relation between the parameters of the problem such that, when it is satisfied, the Chern character is compatible with the projective flatness of the bundle.The second part presents results on Laughlin states with quasihole excitations. These states form a vector bundle over the moduli space of quasihole configurations. We compute its Chern character, which matches, term by term, the predicted decomposition of the Berry phase under quasihole exchange into an extensive Aharonov--Bohm contribution and a contribution from fractional statistics.</dcterms:abstract>
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