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<dc:title xml:lang="en">Correlations and quantum dynamics of 1D fermionic models : new results for the Kitaev chain with long-range pairing</dc:title>
<dcterms:alternative xml:lang="fr">Corrélations et dynamique quantique de modèles de fermions 1D : nouveaux résultats sur la chaîne de Kitaev avec pairing à longue portée</dcterms:alternative>
<dc:subject xml:lang="fr">Fermions</dc:subject>
<dc:subject xml:lang="fr">Mécanisme de Kibble-Zurek</dc:subject>
<dc:subject xml:lang="fr">Modèle d’Ising</dc:subject>
<dc:subject xml:lang="en">Fermions in one dimension</dc:subject>
<dc:subject xml:lang="en">Long-range interactions,</dc:subject>
<dc:subject xml:lang="en">Entanglement measures,</dc:subject>
<dc:subject xml:lang="en">Area law violation</dc:subject>
<dc:subject xml:lang="en">Majorana fermions</dc:subject>
<dc:subject xml:lang="en">Edge states</dc:subject>
<dc:subject xml:lang="en">Quantum phase transitions</dc:subject>
<dc:subject xml:lang="en">Ising model</dc:subject>
<dc:subject xml:lang="en">Kibble-Zurek mechanism</dc:subject>
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<tef:elementdEntree autoriteExterne="033014051" autoriteSource="Sudoc">Entropie des systèmes quantiques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La première partie de la thèse étudie le diagramme de phase d’une généralisation de la chaîne de Kitaev qui décrit un système fermionique avec un pairing p-wave à long rayon qui tombe avec la distance ℓ comme 1/ℓα. On a analysé les lignes critiques, les corrélations et le comportement de l’entropie d’entanglement avec la taille du système. Nous avons démontré l’existence de deux régimes massifs, (i) où les fonctions de corrélation tombent exponentiellement à de courtes distances et comme puissance à de longues distances (α &gt; 1), (ii) où elles tombent à puissance seulement (α &lt; 1). Dans la seconde région l’entropie d’intrication d’un sous-système diverge logarithmiquement. Remarquablement, sur les lignes critiques, le pairing à long rayon brise la symètrie conforme du modèle pour des α suffisamment petits. On a prouvé ça en calculant aussi l’évolution temporelle de l’entropie d’intrication après un quench. Dans la seconde partie de la thèse nous avons analysé la dynamique de l’entropie d’intrication du modèle d’Ising avec un champ magnétique qui dépend linéairement du temps avec de différentes vitesses. Nous avons un régime adiabatique (de basses vitesses) lorsque le système évolue selon son état fondamental instantané; un sudden quench (de hautes vitesses) lorsque le système est congelé dans son état initial; un régime intermédiaire où l’entropie croît linéairement et, ensuite, elle montre des oscillations du moment que le système se trouve dans une superposition des états excités de l’Hamiltonienne instantanée. Nous avons discuté aussi du mécanisme de Kibble-Zurek pour la transition entre la phase paramagnétique et antiferromagnétique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In the first part of the thesis, we propose an exactly-solvable one-dimensional model for fermions with long-range p-wave pairing decaying with distance ℓ as a power law 1/ℓα. We studied the phase diagram by analyzing the critical lines, the decay of correlation functions and the scaling of the von Neumann entropy with the system size. We found two gapped regimes, where correlation functions decay (i) exponentially at short range and algebraically at long range (α &gt; 1), (ii) purely algebraically (α &lt; 1). In the latter the entanglement entropy is found to diverge logarithmically. Most interestingly, along the critical lines, long-range pairing breaks the conformal symmetry for sufficiently small α. This can be detected also via the dynamics of entanglement following a quench. In the second part of the thesis we studied the evolution in time of the entanglement entropy for the Ising model in a transverse field varying linearly in time with different velocities. We found different regimes: an adiabatic one (small velocities) when the system evolves according the instan- taneous ground state; a sudden quench (large velocities) when the system is essentially frozen to its initial state; and an intermediate one, where the entropy starts growing linearly but then displays oscillations (also as a function of the velocity). Finally, we discussed the Kibble-Zurek mechanism for the transition between the paramagnetic and the ordered phase</dcterms:abstract>
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