RAMAN SPEKTROSKOPIE DISSERTATION

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

Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. All documents in ORBi lu are protected by a user license. Docteur en Physique; Doktor der Naturwissenschaften Number of pages: 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.

University of Luxembourg Library. Besides spektrooskopie 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.

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

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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.

raman spektroskopie dissertation

All documents in ORBi lu are protected by a user license. 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. Doctoral thesis Discipline s: 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 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: Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for many-body effects in graphene.

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

O pen R epository and Bi bliography. Dies trifft auch auf andere zweidimensionale Materialien zu, wie z.

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

The flexibility of our speltroskopie also allows us to demonstrate that non-resonant processes and quantum mechanical interference effects play a significant role in Raman scattering. Wirtz, Ludger Stampfer, Christoph President of the jury: 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.

raman spektroskopie dissertation

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.

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