Speaker
Description
We report precise measurements of inter-species interactions in a bosonic optical lattice clock based on $^{88}$Sr atoms [1]. We observe a nonlinear behavior of the clock density shift, showing features deriving from many-body physics beyond the mean-field theory,even without reaching the quantum degeneracy. This findings enable a cancellation of the density shift systematic effect through a careful choice of a "magic" density and excitation fraction. We discuss the implications of these findings in many-body physics, quantum simulation [2], and precision isotope shift measurements [3], which provide a powerful probe for new physics beyond the Standard Model [4].
[1] J.P. Salvatierra, et al, in preparation (2025).
[2] T. Comparin, et al., Phys. Rev. Lett. 129, 113201 (2022)
[3] H. Miyake, et al., Phys. Rev. Research 1, 033113 (2019)
[4] J. Berengut, et al., Phys. Rev. Lett. 120, 091801 (2018)
