  In this Letter, we study the magnetic transport in AA-stacked bilayer
honeycomb chiral magnets coupled either ferromagnetically or
antiferromagnetically. For both couplings, we observe chirality-induced gaps,
chiral protected edge states, magnon Hall and magnon spin Nernst effects of
magnetic spin excitations. For ferromagnetically coupled layers, thermal Hall
and spin Nernst conductivities do not change sign as function of magnetic field
or temperature similar to single-layer honeycomb ferromagnetic insulator. In
contrast, for antiferromagnetically coupled layers, we observe a sign change in
the thermal Hall and spin Nernst conductivities as the magnetic field is
reversed. We discuss possible experimental accessible honeycomb bilayer quantum
materials in which these effects can be observed.
