Abstract:
Synchrotron radiation had a profound impact on the applications of the Mössbauer effect in all natural sciences. The enormous brilliance of X-rays delivered by these sources enabled access to smallest amounts of materials under extreme conditions and allowed for studies with time resolution and polarization sensitivity that were virtually impossible in the lab. In this way it was possible, for example, to transfer concepts of quantum optics into the regime of hard X-rays [1]. With the advent of ever brighter sources, this research field continues to flourish.
In this talk, I will report about recent developments that are devoted to controlling the X-ray photon emission from collectively excited nuclear states: The precision control of nuclear resonant photon emission via nanosecond transient magnons [1] and a nuclear quantum memory for hard X-ray photon wave packets [2]. The latter development relies on a nuclear frequency comb to control the waveform of X-ray photon wave packets to a high level of accuracy and fidelity using solely mechanical motions. In this way optical quantum memory protocols are extended to ultrashort wavelengths, establishing quantum photonics at X-ray energies.
[1] Lars Bocklage et al., Science Advances 7, eabc3991 (2021)
[2] Sven Velten et al., Science Advances 10, eadn9825 (2024)
Short CV
Ralf Röhlsberger got his PhD in 1994 from the University of Hamburg, Germany. After a Postdoc appointment at the Advanced Photon Source at Argonne National Lab until 1996, he accepted academic positions in Germany at the University of Rostock and the Technical University of Munich. He then became senior scientist at DESY in Hamburg in 2003 where he established a research group on magnetism and coherent phenomena. In parallel, he contributed to the construction of the synchrotron radiation source PETRA III and its nuclear resonant scattering beamline P01. Since 2020 he holds a full professorship for X-ray Science at the University of Jena in common appointment with the Helmholtz Institut Jena. He is the elected Chair of the International Board on the Applications of the Mössbauer Effect (IBAME) since 2021.
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