Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 27: XUV/X-ray Science

A 27.4: Talk

Wednesday, March 7, 2018, 14:45–15:00, K 1.011

Controlling Excitation Dynamics of Mössbauer Nuclei — •Kilian P. Heeg¹, Andreas Kaldun¹, Cornelius Strohm², Patrick Reiser¹, Christian Ott¹, Rajagopalan Subramanian¹, Dominik Lentrodt¹, Johann Haber², Hans-Christian Wille², Stephan Goerttler¹, Rudolf Rüffer³, Christoph H. Keitel¹, Ralf Röhlsberger², Thomas Pfeifer¹, and Jörg Evers¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — ³ESRF - The European Synchrotron, Grenoble, France

Mössbauer nuclei with transitions in the hard x-ray regime are usually probed by single x-ray pulses only, such that advanced concepts in light-matter interaction which, e.g., require control fields, cannot be realized straightforwardly. Here, we generalize a recent method to spectrally amplify x-ray pulses [1] to generate a sequence of two pulses with controlled relative phase. Such tailored x-rays are employed in a two-step interaction scheme: preparation and subsequent control of the excitation dynamics in a resonant target of ⁵⁷Fe Mössbauer nuclei. Our experimental results confirm that the collective nuclear dipole response can indeed be manipulated and we find clear signatures of fundamental processes in light-matter interaction such as stimulated emission and absorption.

[1] K. P. Heeg et al., Science 357, 375 (2017).