DISSERTATION RAMAN SPEKTROSKOPIE

As a first test case, we apply our theory to graphene, for which we use it to study the laser frequency and Fermi energy dependence of the Raman G-peak intensity. Physics and Materials Science To cite this reference: We develop a novel and general, correlation function-based approach for the calculation of Raman scattering rates that can potentially also be applied to ultra-fast Raman spectroscopy out of equilibrium. ORBi lu Detailled reference. In addition to the development of a consistent and comprehensive description of Raman scattering, we derive a novel approach for the calculation of phonon frequencies and the screened electron-phonon coupling. This applies not only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2.

In this thesis, we aim to fill this gap and present a coherent theory of Raman scattering within the framework of many-body perturbation theory. This applies not only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2. Our new method goes beyond the limitations of the methods currently in use and will permit the computation of phonon-related quantities also in systems with strong correlation effects such as Kohn anomalies e. Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. The flexibility of our approach also allows us to demonstrate that non-resonant processes and quantum mechanical interference effects play a significant role in Raman scattering. The latter has so far not been possible with state-of-the-art methods, which can only take into account one of the two effects.

It can be applied also to strongly correlated systems, for which the currently used methods are not entirely satisfactory or insufficient. Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. In this thesis, dissertatioj aim to fill this gap and present a coherent theory of Raman scattering within the framework of many-body perturbation theory.

Docteur en Physique; Doktor der Naturwissenschaften Number of pages: Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert.

  ESSAY TUNGKOL SA PORK BARREL TAGALOG

Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert.

Completed Theses

Wirtz, Ludger Stampfer, Christoph President of the jury: O pen R epository and Bi bliography. In addition to the development of a consistent and comprehensive description of Raman scattering, we derive a novel approach for the calculation of phonon frequencies and the screened electron-phonon coupling. Schmidt, Thomas Member of the jury: We develop a novel and general, correlation function-based approach for the calculation of Raman scattering rates that can potentially also be applied to ultra-fast Raman spectroscopy out of equilibrium.

Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. Here we focus on the spektorskopie of the phenomenon of taman resonances and how it can be used to probe electronic excitation energies and to extract electron and phonon lifetimes.

dissertation raman spektroskopie

In this thesis, we aim to fill this gap and present a coherent theory of Raman scattering within the framework of many-body perturbation theory. O pen R epository and Bi bliography.

Completed Theses | 5th Institute of Physics | University of Stuttgart

All documents in Raan lu are protected by a user license. Physics and Materials Science To cite this reference: The flexibility of our approach also allows us to demonstrate that non-resonant processes and quantum mechanical interference effects play a significant role in Raman scattering.

Our new method goes beyond the limitations of the methods currently in use and spektroskopis permit the computation of phonon-related quantities also in systems with strong correlation effects such as Kohn anomalies e. ORBi lu Detailled reference. University of Luxembourg Library. The latter has so far not been possible with state-of-the-art methods, which can only take into account one of the two effects.

dissertation raman spektroskopie

Physics and Materials Science To cite this reference: Besides these theoretical developments, we present concrete computational recipes for the calculation of Raman intensities that allow the inclusion of both excitonic effects and non-adiabatic effects of lattice vibrations.

  DAV KAPILDEV HOLIDAY HOMEWORK

ORBi lu Detailled reference.

This versatility, however, makes its theoretical description very challenging and, up to now, no fully satisfactory and general way for the calculation of Raman spectra from first principles exists. This versatility, however, makes its theoretical description very challenging and, up to now, no fully satisfactory and general way for the calculation of Raman spectra from first principles exists.

Our new method goes beyond the limitations of the methods currently in use and will permit the computation of phonon-related quantities also in systems with strong correlation effects such as Kohn anomalies e. As a first test case, we apply our theory to graphene, rajan which we use spsktroskopie to study the laser frequency and Fermi energy dependence of the Raman G-peak intensity. Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for many-body effects in graphene.

We develop a novel and general, correlation function-based approach for the calculation of Raman scattering rates that can potentially also be applied to ultra-fast Raman spectroscopy out of equilibrium.

All documents in ORBi lu are protected by a user license.

The latter has so far not been xissertation with state-of-the-art methods, which can only take into account one of the two effects. Schmidt, Thomas Member of the jury: As a first test case, we apply our theory to graphene, for which we use it to study the laser frequency and Fermi energy dependence of the Raman G-peak intensity.

dissertation raman spektroskopie