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We investigate the electric response of chiral phonons on the low-buckledgroup-IVA monolayers by performing first-principles calculations. The verticalelectric field breaks the degeneracy of phonon modes at high-symmetry $\pm K$points of the phonon Brillouin zone, and the size of the phononic gap isproportional to the strength of the electric field. The gapped phonon modes at$\pm K$ possess chiralities with considerable phonon circular polarizations anddiscrete phonon pseudoangular momenta. The chiralities of phonons are robustagainst the variation of the field strength, but reversed by changing the fielddirection. Electric control of chiral phonons adds a new dimension to the studyof chiral phonons, which has potential use in the design of phononic and valleydevices.

Gate-tunable chiral phonons in low-buckled group-IVA monolayers