Search for dissertations about: "A. Kohn"
Showing result 6 - 10 of 30 swedish dissertations containing the words A. Kohn.
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6. Lattice dynamics : From fundamental research to practical applications
Abstract : The reason to perform calculations in material science usually falls into one of two categories: to predict or explain the origin of material properties. This thesis covers first-principle calculations for solids at extreme conditions, from both of the two mentioned categories. READ MORE
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7. Foundation of Density Functionals in the Presence of Magnetic Field
Abstract : This thesis contains four articles related to mathematical aspects of Density Functional Theory.In Paper A, the theoretical justification of density methods formulated with current densities is addressed. It is shown that the set of ground-states is determined by the ensemble-representable particle and paramagnetic current density. READ MORE
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8. A new generation density functional towards chemical accuracy
Abstract : Density functional theory (DFT) has become the leading method in calculating theelectronic structures and properties from first principles. In practical applicationsof DFT in the frame work of Kohn-Sham (KS) method, an approximate exchange-correlation functional has to be chosen. READ MORE
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9. Topics in Nonlinear Elliptic Differential Equations
Abstract : In this thesis we examine the existence of solutions to nonlinear elliptic partial differential equations via variational methods.In Paper I we consider the existence of constrained minimizers which correspond to solutions of equations involving the iterated Laplacian, the iterated p-Laplacian and the critical Sobolev exponent. READ MORE
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10. Gaps, Traps and Lattices - Correlations in Small Quantum Systems
Abstract : This dissertation investigates properties of two-dimensional many-body systems. Studies are performed using the Spin-Density Functional Theory with the Local Spin-Density Approximation, and numerical exact diagonalization. READ MORE