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Abstract
Beginning with a Density Functional Theory calculation and ending with a full manybody description, the theoretical methods relevant for this thesis are derived. They are used to simulate the dynamics of the thoroughly studied Nickeloxide crystal under the influence of a driving laser. The conditions in which various excitations are possible are being discussed, as well as how they behave in the time domain and how Auger-Meitner decay influences this behaviour. Similar methods are applied to the completely different system of Sulphur-hexafluoride. It is shown that a tuning laser can increase the effective exchange interaction, which couples various many-body states. The experimental measurement is reproduced using several theoretical methods. The presented technique is a contribution to the field of laser controlled chemical reactions. The last system under consideration is Holmium-doped Gold. The electron capture spectrum of Holmium is calculated, and the effect of Auger-Meitner decay and the Gold environment incorporated as a self-energy. This ab initio approach leads to a novel degree of agreement with the experimental measurement, paving the way to eventually extracting the mass of the electron neutrino from the results.
Document type: | Dissertation |
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Supervisor: | Haverkort, Prof. Dr. Maurits W. |
Place of Publication: | Heidelberg |
Date of thesis defense: | 19 May 2021 |
Date Deposited: | 01 Jun 2021 06:28 |
Date: | 2021 |
Faculties / Institutes: | The Faculty of Physics and Astronomy > Institute for Theoretical Physics |
DDC-classification: | 530 Physics |