  About a century ago, Born proposed a possible matter of state, ferroelectric
fluid, might exist if the dipole moment is strong enough. The experimental
realisation of such states needs magnifying molecular polar nature to
macroscopic scales in liquids. Here, we report on the discovery of a novel
chiral liquid matter state, dubbed chiral ferronematic, stabilized by the local
ferroelectric ordering coupled to the chiral helicity. It carries the polar
vector rotating helically, corresponding to a helieletric structure, analogous
to the magnetic counterpart of helimagnet. The state can be retained down to
room-temperature and demonstrates gigantic dielectric and nonlinear optical
responses. The novel matter state opens a new chapter for exploring the
material space of the diverse ferroelectric liquids.
