Browsing Fakultät für Physik (inkl. GAUSS) by Advisor "Kehrein, Stefan Prof. Dr."
Now showing items 1-6 of 6
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A Unitary Perturbation Theory Approach to Real-Time Evolution in the Hubbard Model
(2019-10-29)We advance perturbative approaches for out-of-equilibrium quantum many-body systems by applying unitary perturbation theory to the real-time evolution of the weakly interacting Hubbard model in d > 1 dimensions. We derive ... -
A Variational Cluster Approximation for the Heisenberg Model
(2017-04-13)In this thesis we present a novel variational cluster approximation for Heisenberg spin systems. It is based on the self-energy functional theory by Potthoff for fermionic and bosonic models with local interactions. To ... -
Dynamics of isolated quantum many-body systems far from equilibrium
(2018-01-22)This thesis addresses different aspects of the dynamics of isolated quantum many-body systems far from equilibrium, ranging from transient phenomena at short times to questions about relaxation and equilibration at late ... -
Microscopic foundation of the Eigenstate Thermalization Hypothesis
(2023-03-20)The Eigenstate Thermalization Hypothesis (ETH) explains how isolated quantum many-body systems thermalize by proposing that each energy eigenstate is already thermal. The hypothesis is believed to be essential to the ... -
Quantum quench dynamics in the transverse field Ising model of fully connected spins
(2021-04-06)The transverse field Ising model of N fully connected spins provides a mathematical accessible, yet non-trivial, system to investigate the non-thermal dynamics after a sudden quantum quench. The focus in this thesis is ... -
Thermalization in one-dimensional quantum-many-body systems
(2017-01-16)We consider the thermalization of the momentum distribution in two one-dimensional models. The first one is the integrable Hubbard model with an additional integrability breaking term in the Hamiltonian, which is a ...