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http://dx.doi.org/10.18419/opus-10991
Autor(en): | Cao, Xiaodong |
Titel: | Extensions of dynamical mean-field theory to non-local correlations and multi-band systems |
Erscheinungsdatum: | 2019 |
Dokumentart: | Dissertation |
Seiten: | v, 141 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-110082 http://elib.uni-stuttgart.de/handle/11682/11008 http://dx.doi.org/10.18419/opus-10991 |
Zusammenfassung: | We have shown the importance and necessity of the inclusion of non-local correlations in the standard dynamical mean-field theory (DMFT) by the TRILEX study of the hole-doped adadom surface systems. Furthermore, the essential roles of the long-range interaction and lattice symmetry in triggering the superconducting pairing are revealed by analyzing the momentum resolved response functions. In order to include non-local correlations in the cluster extensions of DMFT and also handle multi-band systems, we move on to develop efficient impurity solver which lies at the core of DMFT calculations. By rotating to the natural-orbital basis, a projection framework on both frequency- and time-domain are proposed and tested. Furthermore, to counter the intrinsic difficulties of the MPS representation of the many-body wave function of a multi-band system, we have proposed a tree tensor-product states to capture the entanglement structures of multi-band models correctly. This solver has been tested by solving the prototypical SrVO3 and shows great potential for further applications. |
Enthalten in den Sammlungen: | 08 Fakultät Mathematik und Physik |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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PHDThesis.pdf | 10,74 MB | Adobe PDF | Öffnen/Anzeigen |
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