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1. 1. Ensemble Green's Function Theory for Interacting Electrons with Degenerate Ground States

   Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Författare :Erik Linnér; [2019]
   Nyckelord :Green s function; Degeneracy; Density matrix; Ensemble; GW; Zero-temperature; Finite-temperature; Hubbard model; Two-dimensional harmonic oscillator; Ising model; Hydrogen-like model; Physics and Astronomy;

   Sammanfattning : An ensemble Green's function theory for many-electron systems with degenerate ground states, based on the von Neumann density matrix formalism, is proposed. The formalism is constructed without an assumption of an adiabatic connection. An ensemble analogue of Hedin's equations and the GW Approximation (GWA) is constructed. LÄS MER

3. 2. Supersymmetry in Quantum Mechanics

   Kandidat-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

   Författare :Simon Kuberski; [2014]
   Nyckelord :supersymmetric quantum mechanics; partner potentials; quantum mechanics; partner Hamiltonian; shape invariant potential; shape invariance; Morse potential; Physics and Astronomy;

   Sammanfattning : This thesis gives an introduction to the basic formalism of one-dimensional supersymmetric quantum mechanics. The factorization of a Hamiltonian is used to create a supersymmetric partner Hamiltonian. LÄS MER