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. 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. 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:

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. 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. Wirtz, Ludger Stampfer, Christoph President 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.

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

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raman spektroskopie dissertation

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. University of Luxembourg Library.

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

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.

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

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. ORBi lu Detailled reference. Wirtz, Ludger Stampfer, Christoph President of the jury: It can be applied also to strongly correlated systems, for which the currently used methods are not entirely satisfactory or insufficient.

raman spektroskopie dissertation

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.

Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert. Schmidt, Thomas Member of the jury: Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for spektroskope effects in graphene.

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Completed Theses

Physics dssertation 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.

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.

raman spektroskopie dissertation

Docteur en Physique; Doktor der Naturwissenschaften Number of pages: 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. 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.

Doctoral thesis Discipline s: O pen R epository and Bi bliography. This applies not only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2.