Contributions of negative-energy states to the E2-M1 polarizability of the Sr clock
| Autor: | Wu, Fang-Fei, Shi, Ting-Yun, Tang, Li-Yan |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | With the improvement of high-precision optical clock, the higher-order multipolar interaction between atoms and light needs quantitative evaluation. However for the Sr clock, the differential dynamic E2-M1 polarizability at the magic wavelength has contradictions among available theoretical and experimental results. Recently, the new experimental measurement of S. D\"{o}rscher {\em et al.} [arXiv: 2210. 14727] is consistent with measurement of Ushijima {\em et al.}, which poses new challenges to theory and urgently calls for theoretical explanations. In present work, we investigate contributions of negative-energy states to the E2 and M1 polarizabilities. We find that for the M1 polarizability, the contribution from negative-energy states is crucial and dominant. Our new theoretical result for E2-M1 polarizability difference is $-7.74(3.92)\times 10^{-5}$ a.u., which is in good agreement with the recent experiment of S. D\"{o}rscher et al., so the inconsistency problem of E2-M1 polarizability in the Sr clock between theory and experiment is eliminated. Comment: 5 pages, 1 figure |
| Databáze: | arXiv |
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