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 “"Semiklassik"”.
-
Semiclassical asymptotics for the scattering amplitude in the presence of focal points at infinity
We consider scattering in $\R^n$, $n\ge 2$, described by the Schr\"odinger operator $P(h)=-h^2\Delta+V$, where $V$ is a short-range potential. With the aid of Maslov theory, we give a geometrical formula for the semiclassical asymptotics as $h\to 0$ of the scattering amplitude …
-
Semiklassische Dynamik in starken Laserfeldern
Es werden mit einem semiklassischen Propagator in Anfangswertdarstellung <br>Multiphotonprozesse in starken Laserfelden gerechnet. Mit demselben Verfahren <br>wird die semiklassische Propagation eines Wellenpakets im dreidimensionalen <br>Coulomb-Potential untersucht. Mittels der semiklassischen …
-
Semiklassische Beschreibung des Spin-Boson-Modells
The spin coherent state path integral describing the dynamics of a <br>spin-1/2-system in a magnetic field of arbitrary <br>time-dependence is considered. Defining the path integral as the limit <br>of a Wiener regularized expression, the semiclassical approximation <br>leads to a continuous …
-
Semiclassical hybrid dynamics for open quantum systems
In this work the semiclassical hybrid dynamics is extended in order to be capable of treating open quantum systems considering finite baths. The corresponding phenomena, i.e. decoherence and dissipation, are investigated for various scenarios.
-
Semiclassical approximations for single eigenstates of quantum maps
In der vorliegenden Arbeit wird die Fredholm-Methode zur semiklassischen Berechnung einzelner Eigenzustaende von Quantenabbildungen eingesetzt. Es wird gezeigt, wie auch Eigenzustaende zu entarteten Eigenwerten berechnet werden koennen. Die semiklassische Berechnung eines Eigenzustandes erfolgt …
-
Dynamical Tunneling in Systems with a Mixed Phase Space
Tunneling is one of the most prominent features of quantum mechanics. While the tunneling process in one-dimensional integrable systems is well understood, its quantitative prediction for systems with mixed phase space is a long-standing open challenge. In such systems regions of regular and …