  We study a binary mixture of polar chiral (counterclockwise or clockwise)
active particles in a two-dimensional box with periodic boundary conditions.
Beside the excluded volume interactions between particles, particles are also
subject to the polar velocity alignment. From the extensive Brownian dynamics
simulations, it is found that the particle configuration (mixing or demixing)
is determined by the competition between the chirality difference and the polar
velocity alignment. When the chirality difference competes with the polar
velocity alignment, the clockwise particles aggregate in one cluster and the
counterclockwise particles aggregate in the other cluster, thus particles are
demixed and can be separated. However, when the chirality difference or the
polar velocity alignment is dominated, particles are mixed. Our findings could
be used for the experimental pursuit of the separation of binary mixtures of
chiral active particles.
