Collective nuclear excitation and pulse propagation in single-mode x-ray waveguides

• URL: http://arxiv.org/abs/2403.06508v2
• Date: Mon, 25 Nov 2024 09:56:26 GMT
• Title: Collective nuclear excitation and pulse propagation in single-mode x-ray waveguides
• Authors: Leon M. Lohse, Petar Andrejić, Sven Velten, Malte Vassholz, Charlotte Neuhaus, Ankita Negi, Anjali Panchwanee, Ilya Sergeev, Adriana Pálffy, Tim Salditt, Ralf Röhlsberger,
• Abstract summary: M"ossbauer nuclei constitute exceptionally clean quantum-optical systems with transitions in the hard x-ray energy range. We design and demonstrate the so-far unexplored nuclear resonant x-ray propagation in thin-film waveguides. Our findings open up a new design space for experiments in nuclear resonant scattering and nuclear quantum optics.
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• Abstract: M\"ossbauer nuclei constitute exceptionally clean quantum-optical systems with transitions in the hard x-ray energy range, which, placed in x-ray waveguides, are a uniquely capable platform to study collective radiative effects in waveguide quantum electrodynamics (QED). In this work, we design and demonstrate the so-far unexplored nuclear resonant x-ray propagation in thin-film waveguides coupled in forward incidence, resolving excitation and collective evolution of M\"ossbauer nuclei in both time and position. To describe the effects of geometry on propagation and collective evolution, we present a unifying theoretical model. Our findings not only open up a new design space for experiments in nuclear resonant scattering and nuclear quantum optics, but also demonstrate a nanometer-sized x-ray source with extreme temporal and spatial coherence. %which previously were limited to either unstructured foil samples or translation-invariant reflectivity and diffraction configurations. This gives access to a new regime of waveguide QED with hard x-rays and furthermore paves a new route to coherent spectro-microscopic investigations at the nanoscale.

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