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Conventional topological insulators exhibit exotic gapless edge or surfacestates, as a result of non-trivial bulk topological properties. Inperiodically-driven systems the bulk-boundary correspondence is fundamentallymodified and knowledge about conventional bulk topological invariants isinsufficient. While ultracold atoms provide excellent settings for cleanrealizations of Floquet protocols, the observation of real-space edge modes hasso far remained elusive. Here we demonstrate an experimental protocol forrealizing chiral edge modes in optical lattices, by creating a topologicalinterface using a potential step that is generated with a programmable opticalpotential. We show how to efficiently prepare particles in these edge modes inthree distinct Floquet topological regimes that are realized in aperiodically-driven honeycomb lattice. Controlling the height and sharpness ofthe potential step, we study how edge modes emerge at the interface and how thegroup velocity of the particles is modified as the sharpness of the potentialstep is varied.

Real-space detection and manipulation of topological edge modes with ultracold atoms