  After the recognition of the possibility to implement Majorana fermions using
the building blocks of solid-state matters, the detection of this peculiar
particle has been an intense focus of research. Here we experimentally
demonstrate a collection of Majorana fermions living in a one-dimensional
transport channel at the boundary of a superconducting quantum anomalous Hall
insulator thin film. A series of topological phase changes are controlled by
the reversal of the magnetization, where a half-integer quantized conductance
plateau (0.5e2/h) is observed as a clear signature of the Majorana phase. This
transport signature can be well repeated during many magnetic reversal sweeps,
and can be tracked at different temperatures, providing a promising evidence of
the chiral Majorana edge modes in the system.
