Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.61: Poster

Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof

Interplay between collective Lamb shift and hyperfine splitting in resonant x-ray scattering — •Petar Andrejić, Xiangjin Kong, and Adriana Pálffy — Max Planck Institute for Nuclear Physics, 69117 Heidelberg,Germany

In an ensemble of identical atoms, cooperative effects like superradiance may alter the decay rates and the transition energies may be shifted from the single-atom value by the so-called collective Lamb shift. While such effects in ensembles of two-level systems are well understood, realistic multi-level systems are more difficult to handle. Mössbauer nuclei in x-ray thin-film cavities are a clean quantum optical system in which the collective Lamb shift has been observed [1].

Here, we present a quantitative study of ensembles of ⁵⁷Fe nuclei which considers for the first time the action of both an external magnetic field and an intrinsic quadrupole splitting. We show that a collective contribution to the level shifts appears that can amount to sizable deviations from the single-atom hyperfine splitting due to the interplay with the collective Lamb shift. We discuss possible experimental evidence of deviations in the radiation spectrum compared to the case of single-nucleus magnetic-field-induced splitting [2].

[1] R. Röhlsberger et al., Science 328, 1248 (2010).

[2] X. Kong and A. Pálffy, Phys. Rev. A 96, 033819 (2017).