Collective nuclear excitation dynamics in mono-modal x-ray waveguides

• URL: http://arxiv.org/abs/2403.06508v1
• Date: Mon, 11 Mar 2024 08:35:04 GMT
• Title: Collective nuclear excitation dynamics in mono-modal x-ray waveguides
• Authors: Leon M. Lohse, Petar Andreji\'c, Sven Velten, Malte Vassholz, Charlotte Neuhaus, Ankita Negi, Anjali Panchwanee, Ilya Sergeev, Adriana P\'alffy, Tim Salditt, Ralf R\"ohlsberger
• Abstract summary: M"ossbauer nuclei placed in planar x-ray waveguides show distinct temporal emission characteristics. Our findings pave the way for applications ranging from fundamental studies of cooperative emission at hard x-ray frequencies up to new methods of narrowband x-ray control via the engineering of collective radiation patterns.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Ensembles of identical atoms exhibit peculiar collective properties in their interaction with radiation depending on geometry and environment where they are embedded in. A remarkably clean and versatile platform to study collective effects in resonant light scattering are M\"ossbauer nuclei placed in planar x-ray waveguides. Here we conceive and demonstrate experimentally distinct temporal emission characteristics in these systems, ranging from a tunable accelerated exponential decay all the way to a pronounced oscillatory emission pattern, depending on the waveguide geometry and mode of excitation. The observed temporal and spatial emission characteristics of the collectively excited nuclear state in the waveguide -- the nuclear exciton -- are well reproduced by a unified theoretical model. Our findings pave the way for applications ranging from fundamental studies of cooperative emission at hard x-ray frequencies up to new methods of narrowband x-ray control via the engineering of collective radiation patterns.

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