  We numerically investigate the ratchet transport of mixtures of active and
passive particles in a transversal asymmetric channel.A big passive particle is
immersed in a 'sea' of active particles. Due to the chirality of active
particles, the longitudinal directed transport is induced by the transversal
asymmetry. For the active particles, the chirality completely determines the
direction of the ratchet transport, the counterclockwise and clockwise
particles move to the opposite directions and can be separated. However, for
the passive particle, the transport behavior becomes complicated, the direction
is determined by competitions among the chirality, the self-propulsion speed,
and the packing fraction. Interestingly, within certain parameters, the passive
particle moves to the left,while active particles move to the right. In
addition, there exist optimal parameters(the chirality, the height of the
barrier, the self-propulsion speed and the packing fraction) at which the
rectified efficiency takes its maximal value. Our findings could be used for
the experimental pursuit of the ratchet transport powered by chiral active
particles.
