Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 6 of 6 for “"Renormierungsgruppe"”.
-
On the competition of superconductivity, antiferromagnetism and charge order in the high-Tc compounds
… (SSE) in Kapitel 1 und der Contractor Renormierungsgruppen Ansatz (CORE), s.Kapitel 2). Die zentrale Idee dieser Dissertationsschrift besteht darin, diese verschiedenen Konzepte zu kombinieren, um ein besseres Verständnis der Hochtemperatursupraleiter zu erhalten. Im zweiten Teil dieser …
-
Functional renormalization group studies of quantum transport through mesoscopic systems
The progress in micro-fabrication technologies makes it possible to address individual, tailored, mesoscopic structures with sizes on a nanometer to micrometer scale. The transport properties of such quasi zero- or one-dimensional systems are considerably influenced by the electron-electron …
-
The functional renormalization group for zero-dimensional quantum systems in and out of equilibrium
We study transport properties of quantum impurity systems using the functional renormalization group. The latter is an RG-based diagrammatic tool to treat Coulomb interactions in a fast and flexible way. Prior applications, which employed a simple first-order (Hartree-Fock-like) scheme to truncate …
-
Kondo effect out of equilibrium
Correlations are a central ingredient of modern condensed matter physics. With the advent of mesoscopic physics, it became possible to study correlated systems in non-equilibrium situations, which can be reached by e.g. driving a constant current through a quantum dot. A basic question is how …
-
Decoherence effects in nonequilibrium transport through mesoscopic systems
Nonequilibrium electron transport through mesoscopic systems has recently attracted a great amount of attention in both experimental and theoretical physics. Of particular interest are systems where the spin degree of freedom of the electron plays an important role because their investigation might …
-
The adaptive time-dependent density matrix renormalization group method : development and applications
In this work we develop a new numerical method, the adaptive time-dependent density-matrix renormalization-group (adaptive t-DMRG), which turns out to be very well suited to investigate time-dependent phenomena in one-dimensional strongly correlated systems. The method is based on the original …