Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.54: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal

Collective hyperfine splitting in resonant x-rays scattering — •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 systems of ⁵⁷Fe nuclei under the action of an external magnetic field, where a collective contribution to the level shifts appears that can amount to seizable deviations from the single-atom magnetic hyperfine splitting. We develop a formalism to describe single-photon superradiance in multi-level systems and identify three parameter regimes, two of which present measurable deviations in the radiation spectrum compared to the case of single-nucleus magnetic-field-induced splitting [2]. All three regimes should be realizable in planar x-ray cavities with an embedded nuclear layer under experimental parameters available today.

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

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