State-dependent interactions in ultracold 174Yb probed by optical clock spectroscopy

Wereport on the measurement of the scattering properties of ultracold Yb-174 bosons in a three-dimensional optical lattice. Site occupancy in an atomic Mott insulator is resolved with high-precision spectroscopy on an ultranarrow, metrological optical clock transition. Scattering lengths and loss rate coefficients for Yb-174 atoms in different collisional channels involving the ground state S-1(0) and the metastable P-3(0) states are derived. These studies set important constraints for future experimental studies of two-electron atoms for quantum-technological applications.