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We characterize inter- and intraisotope interorbital interactions betweenatoms in the 1S0 ground state and the 3P0 metastable state in interactingFermi-Fermi mixtures of 171Yb and 173Yb. We perform high-precision clockspectroscopy to measure interaction-induced energy shifts in a deep 3D opticallattice and determine the corresponding scattering lengths. We find the elasticinteraction of the interisotope mixtures 173Yb_e-171Yb_g and 173Yb_g-171Yb_e tobe weakly attractive and very similar, while the corresponding two-body losscoefficients differ by more than two orders of magnitude. By comparingdifferent spin mixtures we experimentally demonstrate the SU(2)xSU(6) symmetryof all elastic and inelastic interactions. Furthermore, we measure thespin-exchange interaction in 171Yb and confirm its previously observedantiferromagnetic nature.

Interorbital Interactions in an SU(2)xSU(6)-Symmetric Fermi-Fermi Mixture