  Quantum Hall physics is at the heart of research on both matter and
artificial systems, such as cold atomic gases, with non-trivial topological
order. We report on the observation of a chiral edge current by transferring
atomic wavepackets simultaneously to opposite edges of a synthetic Hall system
realized in the two-dimensional state space formed by one spatial and one
synthetic dimension encoded in the J=6 electronic spin of erbium atoms. To
characterize the system, the Hall drift of the employed atomic Bose-Einstein
condensate in the lowest Landau-like level is determined. The topological
properties are verified by determining the local Chern marker, and upon
performing low-lying excitations both cyclotron and skipping orbits are
observed in the bulk and edges respectively. Future prospects include studies
of novel topological phases in cold atom systems.
