  The physical realization of Chern insulators is of fundamental and practical
interest, as they are predicted to host the quantum anomalous Hall effect
(QAHE) and topologically protected chiral edge states which can carry
dissipationless current. The realization of the QAHE state has however been
challenging because of the complex heterostructures and sub-Kelvin temperatures
required. Time-reversal symmetry breaking Weyl semimetals, being essentially
stacks of Chern insulators with inter-layer coupling, may provide a new
platform for the higher temperature realization of robust QAHE edge states. In
this work we present a combined scanning tunneling spectroscopy and theoretical
investigation of a newly discovered magnetic Weyl semimetal, Co3Sn2S2. Using
modeling and numerical simulations we find that chiral edge states can be
localized on partially exposed Kagome planes on the surface of a Weyl
semimetal. Correspondingly, our STM dI/dV maps on narrow kagome Co3Sn terraces
show linearly dispersing quantum well like states, which can be attributed to
hybridized chiral edge modes. Our experiment and theory results suggest a new
paradigm for studying chiral edge modes in time-reversal breaking Weyl
semimetals. More importantly, this work leads a practical route for realizing
higher temperature QAHE.
