Contribution of negative-energy states to multipolar polarizabilities of the Sr optical lattice clock

ORAL

Abstract

We address the problem of lattice light shifts in the Sr clock caused by multipolar M1 and E2 atom-field interactions. We present a simple but accurate formula for the magnetic-dipole polarizability that takes into account the contributions of both the positive- and negative-energy states. We calculate the contribution of

negative-energy states to the M1 polarizabilities of the clock 1S0 and 3P0 states at the magic frequency. Taking these contributions into account, we obtain good agreement with the experimental results, explaining the major discrepancy between theory and experiment.

*This work was supported in part by NSF QLCI Award No. OMA-2016244, by ONR Grant No. N00014-20-1-2513, and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant No. 856415).

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Presenters

  • Sergey G Porsev

    • University of Delaware

Authors

  • Sergey G Porsev

    • University of Delaware

  • Mikhail G Kozlov

    • PNPI of NRC "Kurchatov Institute" and LETI

  • Marianna Safronova

    • U Delaware
    • University of Delaware