Spin Clock Experiments and Electric Dipole Moments

Spin precession experiments are among the most sensitive probes for new physics beyond the Standard Model.
They test fundamental symmetries — in particular time-reversal (T) and CP invariance — through the search for permanent electric dipole moments (EDMs) and related spin-dependent effects.
These “spin clock” experiments rely on extremely stable and homogeneous magnetic fields, precise electric field control, and long-lived spin coherence.
Even minute frequency shifts in spin precession can reveal new sources of CP violation, potentially linked to the observed matter–antimatter asymmetry of the Universe.

Our Research Focus

• Precision spin precession in ultra-low-field environments
• Development of stable magnetic and electric field systems
• Co-magnetometry and spin clock operation
• Identification and mitigation of systematic effects
• Integration of optical magnetometry and 4π field reconstruction

Current Projects

• PanEDM – Neutron Electric Dipole Moment Search (ILL Grenoble)
  Search for the neutron EDM using ultra-cold neutrons, advanced magnetic shielding, and optical magnetometer arrays.
• Electric Dipole Moment Search with Atoms and Molecules
  A laboratory-scale test setup to develop and validate hardware and measurement concepts for future EDM experiments, including 4π magnetometry and spatial spin readout.
• Simulations for Precision Measurements
  We also use a range of different simulations (Monte Carlo, finite element, Geant4) to simulate experiments and processes.