  We present a theoretical and numerical study on the motion of isotropic
helicoids in complex flows. These are particles whose motion is invariant under
rotations but not under mirror reflections of the particle. This is the
simplest, yet unexplored, extension of the much studied case of small spherical
particles. We show that heavy isotropic helicoids, due to the coupling between
translational and rotational degrees of freedom, preferentially sample
different helical regions in laminar or chaotic advecting flows. This opens the
way to control and engineer particles able to track complex flow structures
with potential applications to microfluidics and turbulence.
