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Electronic Bridge processes in ²²⁹Th-doped LiCAF and LiSAF

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arxiv 2507.05070 v1 pith:4JZN32RW submitted 2025-07-07 physics.atom-ph cond-mat.mtrl-scinucl-ex

Electronic Bridge processes in ²²⁹Th-doped LiCAF and LiSAF

classification physics.atom-ph cond-mat.mtrl-scinucl-ex
keywords electronicbridgenuclearexcitationlaser-assistedmechanismsspontaneousclock
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Electronic bridge mechanisms driving the $^{229}$Th nuclear clock transition in the vacuum-ultraviolet-transparent crystals $^{229}$Th:LiCAF (LiCaAlF$_6$) and $^{229}$Th:LiSAF (LiSrAlF$_6$) are investigated theoretically. Due to doping-induced symmetry breaking within the host crystal, electronic defect states emerge around the thorium nucleus and can facilitate nuclear (de)excitation via laser-assisted electronic bridge mechanisms. We investigate spontaneous and laser-assisted electronic bridge schemes for different charge compensation mechanisms. While the calculated spontaneous electronic bridge rates are very small, laser-assisted electronic bridge schemes for nuclear (de)excitation turn out to be significantly more efficient than both spontaneous nuclear decay and direct laser excitation, offering promising prospects for the future clock operation.

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