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Title
Electronic correlations in the Hubbard model on the Kagome lattice / Klaus Steiner
Additional Titles
Elektronische Korrelation im Hubbard-Modell auf dem Kagome-Gitter
AuthorSteiner, Klaus
CensorHeld, Karsten ; Kaufmann, Josef
PublishedWien, 2018
Description78 Seiten : Diagramme
Institutional NoteTechnische Universität Wien, Diplomarbeit, 2018
Annotation
Abweichender Titel nach Übersetzung der Verfasserin/des Verfassers
LanguageEnglish
Document typeThesis (Diplom)
Keywords (DE)Electronische Korrelationen / Quanten-Monte-Carlo / DQMC / Dynamische Molekularfeldtheorie
Keywords (EN)Electronic Korrelations / Quantum Monte Carlo / DQMC / Dynamical mean field theory
URNurn:nbn:at:at-ubtuw:1-117963 Persistent Identifier (URN)
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 The work is publicly available
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Abstract (English)

The aim of this thesis is the investigation of electronic correlations in the intermediate region between the metallic and insulating phase of the frustrated Kagome lattice. Most previous studies address the ground state of the Heisenberg model on the Kagome lattice, and therefore only the purely insulating phase. However, we go a step further by studying the Hubbard model on the Kagome lattice and thus including metallic contributions. We solve the Hubbard model with the determinant quantum Monte Carlo (DQMC) method and compare to results of the dynamical mean field theory (DMFT). First we study the half-filled system across the range of the Mott-Hubbard metal-insulator transition, and then the electron doped system, where the chemical potential is in the center of the flat band. In various post-processing steps we calculate the k-integrated spectral functions, the k-resolved spectral functions, the equal-time magnetic structure factors and the dynamic magnetic structure factors.

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