Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 8: Precision Measurements I (joint session Q/A)
A 8.3: Talk
Monday, March 11, 2024, 17:30–17:45, HS 1221
Electronic Bridge schemes in 229Th doped LiCAF — •Tobias Kirschbaum1, Martin Pimon2, and Adriana Pálffy1 — 1Julius-Maximilians-Universität Würzburg, Germany — 2Technische Universität Wien, Austria
Large band gap crystals such as CaF2 or LiCaAlF6 (LiCAF) are an ideal inert host for the nuclear clock candidate 229Th. Among others, these crystals are transparent with respect to the clock transition at ≈ 8 eV and a large number of nuclei can be interrogated at the same time [1]. However, DFT calculations indicate that doping of 229Th in these crystals leads to the formation of localized electronic states in the band gap, so-called defect states [2]. Due to their vicinity to the nuclear transition energy, these can be used for effective nuclear excitation via the Electronic Bridge mechanism, as we could show for the case of Th-doped CaF2 crystals [2,3].
Here, we investigate theoretically different driven Electronic Bridge schemes for 229Th doped LiCAF crystals and present the corresponding excitation rates. These schemes enable a more efficient nuclear excitation/deexcitation compared to direct photoexcitation. The results are discussed in conjuncture with the design of a solid-state nuclear clock.
[1] G. A. Kazakov et al., New J. Phys. 14, 083019 (2012).
[2] B. S. Nickerson et al., Phys. Rev. Lett 125, 032501 (2020).
[3] B. S. Nickerson et al., Phys. Rev. A 103, 053120 (2021).
Keywords: Nuclear clock; VUV transparent crystals; Electromagnetic transitions