  Efficient chirality sorting is now highly demanded to separate assembled
mesoscopic chiral structures which are of very special physical properties
rather than their achiral counterparts or those at the single-particle level.
However, the efficiency of conventional methods usually suffers from the
thermal or external noise. Here, we propose a mechanism utilizing external
noise to attain a tunable sorting of mesoscopic chiral particles in an achiral
periodic potential. The complete chirality-separation stems from the path
selection by a noise-induced biased flux in a nonequilibrium landscape. Such
mechanism provides a practicable way to control the motion of chiral particles
by simply adjusting the noise intensity, which is demonstrated by simultaneous
separation of several kinds of enantiomorphs with different degrees of
chirality. The robustness and generalizability of noise-tuned chirality sorting
is further verified in systems with other types of periodic potentials or
spatially/temporally correlated noise.
