Direkt zum InhaltDirekt zur SucheDirekt zur Navigation
▼ Zielgruppen ▼

Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Department of Physics

Humboldt-Universität zu Berlin | Faculty of Mathematics and Natural Sciences | Department of Physics | Colloquium | Colloquia | Department Colloquium: PD Dr. Ekkehard Peik (Physikalisch-Technische Bundesanstalt)

Department Colloquium: PD Dr. Ekkehard Peik (Physikalisch-Technische Bundesanstalt)

Lecture on: "Trapped ion optical clocks and tests of the equivalence principle"
When Jan 15, 2019 from 03:15 to 05:00 (Europe/Berlin / UTC100) iCal
Where Lise-Meitner-Haus, Christian-Gerthsen-Hörsaal, Newtonstraße 15, 12489 Berlin

Department Colloquium:: PD Dr. Ekkehard Peik (Physikalisch-Technische Bundesanstalt, Braunschweig) will speak about "Trapped ion optical clocks and tests of the equivalence principle".

Abstract

Optical clocks based on different atoms and ions with systematic uncertainties in the low 10-18 range allow for frequency comparisons and precise measurements of frequency ratios [1]. These can be used in tests of fundamental physics, especially quantitative tests of relativity and searches for violations of the equivalence principle [2]. The 171Yb+ optical clock that is based on the extremely narrow S-F electric octupole transition possesses a favorable combination of small systematic uncertainty and high sensitivity for such tests because of the strongly relativistic character of the excited state [3]. In comparisons of two 171Yb+ single-ion clocks and primary Cs clocks at PTB we perform tests for temporal variations of the fine structure constant, the proton-to-electron mass ratio and for violations of local Lorentz invariance [4].

1. A. D. Ludlow, M. M. Boyd, Jun Ye, E. Peik, P. O. Schmidt, Rev. Mod. Phys. 87, 637 (2015)

2. M. S. Safronova, D. Budker, D. DeMille, Derek F. Jackson Kimball, A. Derevianko and C. W. Clark, Rev. Mod. Phys. 90, 025008 (2018)

3. N. Huntemann, C. Sanner, B. Lipphardt, Chr. Tamm, and E. Peik, Phys. Rev. Lett. 116, 063001 (2016)

4. C. Sanner, N. Huntemann, R. Lange, Chr. Tamm, E. Peik, M. Safronova, S. Porsev, arXiv 1809.10742