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Research group J. Evers – Division C. H. Keitel
Abstract:
In this thesis thinfilm
cavities with embedded Mössbauer nuclei probed by near-resonant x-ray light are studied
from a quantum optical perspective. A theoretical framework is developed and compact expressions
for the observables are derived for the linear excitation regime, which is encountered in
current experiments. Even advanced cavity layouts can be modeled in excellent agreement with
the results of previous experiments and semi-classical approaches. In the absence of magnetic
hyperfine splitting, the spectral response of the system is found to be formed by tunable Fano
profiles. An experimental implementation of this line shape control allows to extract spectroscopic
signatures with high precision and to reconstruct the phase of the nuclear transition in
good agreement with the theoretical predictions. The alignment of medium magnetization and
polarization control of the x-rays enable to engineer advanced quantum optical level schemes, in
which vacuum induced coherence effects are predicted and successfully demonstrated in an experiment.
Furthermore, it is shown that group velocity control for x-ray pulses can be achieved
in the cavity. A scheme for its observation is proposed and then employed to experimentally
confirm sub-luminal x-ray propagation. Finally, non-linear effects, which could become accessible
with future light sources, are explored and a non-linear line shape control mechanism is
discussed.
