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Found 2 essays matching the above criteria.

1. 1. Combining the GW Approximation with the Hubbard I Approximation for strongly correlated materials

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Author : Torsten Strunck; [2019]
   Keywords : GWA; GW Approximation; HIA; Hubbard I Approximation; Hubbard-I Approximation; Hubbard model; DMFT; Dynamical Mean Field Theory; strongly correlated materials; electron correlations; solid state physics; Physics and Astronomy;

   Abstract : In this thesis, the GW approximation (GWA, Green's function G times screened interaction W) and the Hubbard I approximation (HIA) are combined in a non-self-consistent one-shot calculation to determine the electronic structure of a one-dimensional strongly-correlated model. The scheme was chosen to incorporate both screening effects through the GWA and strong on-site correlations through the atomic HIA. READ MORE

3. 2. Density Functional Theory for the Hubbard-Holstein model

   University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Author : Pernilla Helmer; [2018]
   Keywords : density functional theory; hubbard; holstein; bethe lattice; cayley tree; dynamical mean field theory; exchange; correlation; exchange correlation potential; xc-potential; Hxc-potential; Physics and Astronomy;

   Abstract : The physics of interacting many-body systems is a very complex and challenging subject. Therefore one in general needs to use simplified models and approximate methods for studying these systems theoretically. READ MORE