  We investigate the quantum anomalous Hall Effect (QAHE) and related chiral
transport in the millimeter-size (Cr0.12Bi0.26Sb0.62)2Te3 films. With high
sample quality and robust magnetism at low temperatures, the quantized Hall
conductance of e2/h is found to persist even when the film thickness is beyond
the two-dimensional (2D) hybridization limit. Meanwhile, the Chern
insulator-featured chiral edge conduction is manifested by the non-local
transport measurements. In contrast to the 2D hybridized thin film, an
additional weakly field-dependent longitudinal resistance is observed in the 10
quintuple-layer film, suggesting the influence of the film thickness on the
dissipative edge channel in the QAHE regime. The extension of QAHE into the
three-dimensional thickness region addresses the universality of this quantum
transport phenomenon and motivates the exploration of new QAHE phases with
tunable Chern numbers. In addition, the observation of the scale-invariant
dissipationless chiral propagation on a macroscopic scale makes a major stride
towards ideal low-power interconnect applications.
