Erlangen 2022 – wissenschaftliches Programm
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SYAD: Symposium SAMOP Dissertation Prize 2022
SYAD 1: SAMOP Dissertation Prize Symposium
SYAD 1.2: Hauptvortrag
Dienstag, 15. März 2022, 14:30–15:00, Audimax
Searches for New Physics with Yb+ Optical Clocks — •Richard Lange — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
The most advanced atomic clocks are based on laser-cooled trapped atoms or ions and employ forbidden optical transitions as the reference. 171Yb+ provides two such transitions, an electric quadrupole (E2) and an electric octupole (E3) transition, that are particularly well suited to search for physics beyond the Standard Model.
In my talk, I will describe how a comparison of two Yb+(E3) clocks with 4 × 10−18 uncertainty is used to improve limits on a violation of Lorentz symmetry for electrons by about two orders of magnitude. I will also present a long-term comparison of the E3 and E2 transition frequencies that tightens the limit on temporal variations of the fine structure constant α by more than a factor of 20 to below 10−18/yr. The excited state of the E3 transition features an exceptionally long lifetime which we measure with a new method to 1.58(8) years. Finally, novel interrogation methods enable the suppression of clock shifts, for instance by excitation of the ion in the dark center of Laguerre-Gaussian modes. By introducing these techniques and an advanced experimental setup, I will show how the performance of Yb+ optical clocks is improved in the quest to unveil new physics.