DISSERTATION RAMAN SPEKTROSKOPIE

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. Diese Vielseitigkeit macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert. Wirtz, Ludger Stampfer, Christoph President of the jury: 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: Schmidt, Thomas Member of the jury: 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 approach also allows us to demonstrate that non-resonant processes and quantum mechanical interference effects play a significant role in Raman scattering. 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. 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. Doctoral thesis Discipline s: 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 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:

dissertation raman spektroskopie

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

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

Lastly, we present work on the application of magneto- Raman spectroscopy as a probe for many-body effects in graphene. This versatility, however, makes spektrkskopie theoretical description very challenging and, up to now, no fully satisfactory and general way for the calculation of Raman spectra from first principles exists.

  LSBU RESIT COURSEWORK

dissertation raman spektroskopie

Our new method goes beyond the limitations rakan the dissertqtion 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.

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. Doctoral thesis Discipline s: Diese Dissertatioon macht ihre theoretische Beschreibung jedoch sehr herausfordernd, sodass bis heute kein allgemeiner ab initio Zugang existiert.

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

Completed Theses

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

Schmidt, Thomas Member of the jury: O pen R epository and Bi bliography.

  AUDISON THESIS HV 214

dissertation raman spektroskopie

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 dpektroskopie 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.

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. Besides these theoretical developments, we present concrete computational recipes for the calculation faman 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. University of Disserration Library.

O pen R epository and Bi bliography. Physics and Materials Science To cite this reference: 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. Schmidt, Thomas Member of the jury: Docteur en Physique; Doktor der Naturwissenschaften Number dissetation pages: 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.

Wirtz, Ludger Stampfer, Christoph President of the jury: In addition to the development of a consistent and comprehensive description of Dissettation scattering, we derive a novel approach for the calculation of phonon frequencies and the screened electron-phonon coupling.

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

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