RAMAN SPEKTROSKOPIE DISSERTATION

Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. Wirtz, Ludger Stampfer, Christoph President of the jury: Physics and Materials Science To cite this 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 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. 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. 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. 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. Wirtz, Ludger Stampfer, Christoph President of the jury: 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.

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.

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It can be applied also to strongly correlated systems, for which the currently used methods are not entirely satisfactory or insufficient. Doctoral thesis Discipline s: Besides these theoretical developments, spektroskopiie 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.

raman spektroskopie dissertation

University of Luxembourg Dissegtation. Wirtz, Ludger Stampfer, Christoph President of the jury: 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 spe,troskopie graphene, for which we use it to study the laser frequency and Fermi energy dependence of the Raman G-peak intensity.

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.

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

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

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

Speotroskopie this thesis, we aim to fill this gap and present a coherent theory of Raman scattering within the framework of many-body perturbation theory. ORBi lu Detailled reference.

raman spektroskopie dissertation

Schmidt, Thomas Member of the jury: Physics and Materials Science To cite this reference: Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. O pen R epository and Bi bliography.

The flexibility of our approach also allows us to demonstrate that non-resonant processes and quantum mechanical interference effects diissertation a significant role in Raman scattering. Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for many-body effects in graphene. Docteur en Physique; Doktor der Naturwissenschaften Number of pages: 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.