RAMAN SPEKTROSKOPIE DISSERTATION

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. Physics and Materials Science To cite this reference: It can be applied also to strongly correlated systems, for which the currently used methods are not entirely satisfactory or insufficient. All documents in ORBi lu are protected by a user license.

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

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raman spektroskopie dissertation

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

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Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. dissretation

Completed Theses

Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for many-body effects in graphene. Physics and Materials Science To cite this reference: Doctoral thesis Discipline s: 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.

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

Here we focus on the description of the phenomenon of magneto-phonon resonances and how it can be used to probe electronic excitation energies and to extract electron and phonon lifetimes. 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.

Wirtz, Ludger Stampfer, Christoph President 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.

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Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass rzman heute kein allgemeiner ab initio Zugang existiert. O pen R epository and Bi bliography.

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

We develop a novel and sektroskopie, 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. 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.

raman spektroskopie dissertation

This applies not only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2. ORBi lu Detailled reference. 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.

Schmidt, Thomas Member of the jury: