DISSERTATION RAMAN SPEKTROSKOPIE

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

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. ORBi lu Detailled reference. 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. Dies trifft auch auf andere zweidimensionale Materialien zu, wie z.

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

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

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. This versatility, however, makes its theoretical description very challenging s;ektroskopie, up to now, no fully satisfactory and general way for the calculation of Raman spectra from first principles exists.

This applies diesertation only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2. Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for many-body effects in graphene.

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

  PROBLEM SOLVING LESSON 5-6 DILATIONS

dissertation raman spektroskopie

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. 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. Doctoral thesis Discipline s: Dies trifft auch auf andere zweidimensionale Materialien zu, wie z. Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert.

Physics and Materials Science To cite this reference: 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. Doctoral thesis Discipline s: 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. Besides these theoretical developments, we present concrete computational recipes for the calculation of Raman intensities that allow the inclusion of spektroskipie excitonic effects and non-adiabatic effects of lattice vibrations.

Our new method goes beyond the limitations spektrlskopie 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. 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.

dissertation raman spektroskopie

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. Wirtz, Ludger Stampfer, Christoph President of the jury: Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert.

  CRITICAL ESSAY ON MRS TILSCHERS CLASS

Completed Theses

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

The flexibility of our approach also allows us to demonstrate sspektroskopie non-resonant processes and quantum mechanical interference effects play a significant role in Raman scattering. This applies not only to graphene but also to other two-dimensional materials of current interest, such as MoTe2 and MoS2.

dissertation raman spektroskopie

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. O pen R epository and Bi bliography.

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. 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.

ORBi lu Detailled reference. 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. 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.

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.

Physics and Materials Science To cite this reference: ORBi lu Detailled reference.

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