Dynamical extraction of lattice-localized atoms from a superfluid

Bosonic quantum-gas mixtures in optical lattices allow for a wide range of studies including disordered systems, dissipative phenomena and out-of-equilibrium effects. Using a rubidium condensate, we study the coherent transfer of atoms between a superfluid and the orbitals of a deep state-dependent optical lattice, achieved by driving the atoms between two hyperfine ground states. We observe a nontrivial dependence of the transfer efficiency on the coupling strength, linked to the mean-field dynamics of the superfluid.