  We report on the experimental implementation of a spin pump with ultracold
bosonic atoms in an optical superlattice. In the limit of isolated double wells
it represents a 1D dynamical version of the quantum spin Hall effect. Starting
from an antiferromagnetically ordered spin chain, we periodically vary the
underlying spin-dependent Hamiltonian and observe a spin current without charge
transport. We demonstrate a novel detection method to measure spin currents in
optical lattices via superexchange oscillations emerging after a projection
onto static double wells. Furthermore, we directly verify spin transport
through in-situ measurements of the spins' center of mass displacement.
