  We report the experimental realization of a topological Creutz ladder for
ultracold fermionic atoms in a resonantly driven 1D optical lattice. The
two-leg ladder consists of the two lowest orbital states of the optical lattice
and the cross inter-leg links are generated via two-photon resonant coupling
between the orbitals by periodic lattice shaking. The characteristic
pseudo-spin winding in the topologically non-trivial bands of the ladder system
is demonstrated using momentum-resolved Ramsey-type interferometric
measurements. We discuss a two-tone driving method to extend the inter-leg link
control and propose a topological charge pumping scheme for the Creutz ladder
system.
