Driven electronic bridge processes via defect states in 229Th-doped crystals
| Autor: | Tomas Sikorsky, Thorsten Schumm, Andreas Grüneis, Johannes Gugler, Adriana Pálffy, Georgy A. Kazakov, Brenden Scott Nickerson, Pavlo V. Bilous, Martin Pimon, Kjeld Beeks |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
education.field_of_study Atomic Physics (physics.atom-ph) Population FOS: Physical sciences Inverse Context (language use) 01 natural sciences 010305 fluids & plasmas Physics - Atomic Physics Dipole 0103 physical sciences Quadrupole Research group A. Pálffy – Division C. H. Keitel Absorption (logic) Stimulated emission Atomic physics 010306 general physics Multipole expansion education |
| Zdroj: | Physical Review A |
| Popis: | The electronic defect states resulting from doping $^{229}\mathrm{Th}$ in ${\mathrm{CaF}}_{2}$ offer a unique opportunity to excite the nuclear isomeric state $^{229\mathrm{m}}\mathrm{Th}$ at approximately 8 eV via electronic bridge mechanisms. We consider bridge schemes involving stimulated emission and absorption using an optical laser. The role of different multipole contributions, both for the emitted or absorbed photon and nuclear transition, to the total bridge rates are investigated theoretically. We show that the electric dipole component is dominant for the electronic bridge photon. In contradistinction, the electric quadrupole channel of the $^{229}\mathrm{Th}$ isomeric transition plays the dominant role for the bridge processes presented. The driven bridge rates are discussed in the context of background signals in the crystal environment and of implementation methods. We show that inverse electronic bridge processes quenching the isomeric state population can improve the performance of a solid-state nuclear clock based on $^{229\mathrm{m}}\mathrm{Th}$. |
| Databáze: | OpenAIRE |
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