  The skyrmions generated by frustration in centrosymmetric structures host
extra internal degrees of freedom: vorticity and helicity, resulting in
distinctive properties and potential functionality, which are not shared by the
skyrmions stemming from the Dzyaloshinskii-Moriya interaction in
noncentrosymmetric structures. The present work indicates that the
magnetism-driven electric polarization carried by skyrmions provides a direct
handle for tuning helicity. Especially for the in-plane magnetized skyrmions,
the helicity can be continuously rotated and exactly picked by applying an
external electric field for both skyrmions and antiskyrmions. The in-plane
uniaxial anisotropy is beneficial to this manipulation.
