English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The electronic defect states resulting from doping $^{229}$Th in CaF$_2$offer a unique opportunity to excite the nuclear isomeric state $^{229m}$Th atapproximately 8 eV via electronic bridge mechanisms. We consider bridge schemesinvolving stimulated emission and absorption using an optical laser. The roleof different multipole contributions, both for the emitted or absorbed photonand nuclear transition, to the total bridge rates are investigatedtheoretically. We show that the electric dipole component is dominant for theelectronic bridge photon. In contradistinction, the electric quadrupole channelof the $^{229}$Th isomeric transition plays the dominant role for the bridgeprocesses presented. The driven bridge rates are discussed in the context ofbackground signals in the crystal environment and of implementation methods. Weshow that inverse electronic bridge processes quenching the isomeric statepopulation can improve the performance of a solid-state nuclear clock based on$^{229m}$Th.

Driven electronic bridge processes via defect states in $^{229}$Th-doped crystals