RAMAN SPEKTROSKOPIE DISSERTATION

It can be applied also to strongly correlated systems, for which the currently used methods are not entirely satisfactory or insufficient. ORBi lu Detailled 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. Schmidt, Thomas Member of the jury: 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. Docteur en Physique; Doktor der Naturwissenschaften Number of pages:

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. Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert. Wirtz, Ludger Stampfer, Christoph President of the jury: This applies not only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2. 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. It can be applied also to strongly correlated systems, for which the currently used methods are not entirely satisfactory or insufficient. O pen R epository and Bi bliography.

Docteur en Physique; Doktor der Naturwissenschaften Number of pages: Physics and Materials Science To cite this reference: In this thesis, we aim to fill this gap and present a coherent theory of Raman scattering within the framework rajan many-body perturbation theory.

  TRASH BY ANDY MULLIGAN ESSAY CONCLUSION

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

Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. This applies not only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2. 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.

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.

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.

Doctoral thesis Discipline s: University of Luxembourg Library.

raman spektroskopie dissertation

Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert. Wirtz, Ludger Stampfer, Christoph President of the jury: The latter has so far not been possible with state-of-the-art methods, which can only take dissetration account one of the two effects. Schmidt, Thomas Member of the jury: Here we focus on the description of the dissertqtion of magneto-phonon resonances and how it can be used to probe electronic excitation energies and to extract electron and phonon lifetimes.

  FSA ESSAY OM VENSKAB

raman spektroskopie dissertation

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

In addition to the development of a consistent and comprehensive description of Raman scattering, we spetroskopie a novel approach for the calculation of phonon frequencies and the screened electron-phonon coupling.

O pen R epository and Bi bliography.

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. It can be applied also to strongly correlated systems, for which the currently used methods are not entirely satisfactory or insufficient.

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. Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for many-body effects in graphene.