  In this communication, we numerically studied disordered quantum transport in
a quantum anomalous Hall insulator-superconductor junction based on the
effective edge model approach. In particular, we focus on the parameter regime
with the free mean path due to elastic scattering much smaller than the sample
size and discuss disordered transport behaviors in the presence of different
numbers of chiral edge modes, as well as non-chiral metallic modes. Our
numerical results demonstrate that the presence of multiple chiral edge modes
or non-chiral metallic modes will lead to a strong Andreev conversion, giving
rise to half-electron half-hole transmission through the junction structure, in
sharp contrast to the suppression of Andreev conversion in the single chiral
edge mode case. Our results suggest the importance of additional transport
modes in the quantum anomalous Hall insulator-superconductor junction and will
guide the future transport measurements.
