LAUSR

We characterize interand intraisotope interorbital interactions between atoms in the S0 ground state and the P0 metastable state in interacting Fermi-Fermi mixtures of Yb and Yb. We perform high-precision clock spectroscopy to measure interaction-induced energy shifts in a deep 3D optical lattice and determine the corresponding scattering lengths. We find the elastic interaction of the interisotope mixtures YbeYbg and YbgYbe to be weakly attractive and very similar, while the corresponding two-body loss coefficients differ by more than two orders of magnitude. By comparing different spin mixtures we experimentally demonstrate the SU(2)⊗ SU(6) symmetry of all elastic and inelastic interactions. Furthermore, we measure the spin-exchange interaction in Yb and confirm its previously observed antiferromagnetic nature.