Essays about: "Viktor Christiansson"
Found 2 essays containing the words Viktor Christiansson.
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1. The self-screening correction to RPA and GW – A model and ab initio study
University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionenAbstract : The self-screening error in the GW approximation is studied by applying correction schemes beyond the random-phase approximation in model and ab inito calculations. Two model systems in the form of Hubbard dimers, with one and two orbitals per site respectively, are considered. READ MORE
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2. Model study of the linear density response function - A comparison between the exact result and RPA
University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysikAbstract : The time-ordered linear density response function is examined in a model study. Two model dimers are considered; one with one orbital per site and a second one with two orbitals per site. The one-orbital case has U0, the on-site Coulomb interaction, as the only parameter and is solved analytically. READ MORE