Title: Dynamical Mean-Field Theory for Hard-Core Bosons
Language: English
Authors: Huber, Dominik 
Qualification level: Diploma
Advisor: Kuneš, Jan 
Issue Date: 2021
Number of Pages: 39
Qualification level: Diploma
Abstract: 
We formulate dynamical mean-field theory for hard-core bosons by extending bosonic DMFT with broken canonical commutation relations to use for LaCoO3, amongst others. Pointwise convergence of results with finite on-site repulsion toresults with explicit hard-core constraints is found by simulations of different models. Further we find, that a formulation analogous to Dyson-Mori form for fermions is not generally applicable for hard-core bosons due to a divergence at half filled lattice. Last we show a phase transition visible in the occupation of sublattices which can be driven by a change of coupling constants.
Keywords: dynamical mean-fiel theory; hard-core bosons
URI: https://doi.org/10.34726/hss.2021.88340
http://hdl.handle.net/20.500.12708/17350
DOI: 10.34726/hss.2021.88340
Library ID: AC16196235
Organisation: E138 - Institut für Festkörperphysik 
Publication Type: Thesis
Hochschulschrift
Appears in Collections:Thesis

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