  We present the latest results from the search for light dark matter particle
interactions with the DarkSide-50 dual-phase liquid argon time projection
chamber. This analysis, based on the ionization signal only, improves the
existing limits for spin-independent WIMP-nucleon interactions in the $[1.2,
3.6]$ GeV/c$^2$ mass range. The sensitivity is extended down to 40 MeV/c$^2$ by
assuming the Migdal effect, responsible for an additional ionization signal
from the recoiling atom. Finally, we set new constraints to interactions of
dark matter particles with electrons in the final state, namely WIMPs, galactic
axions, dark photons, and sterile neutrinos.
