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Chiral phonons have attracted increasing attention, as they play importantroles in many different systems and processes. However, a method to controlphonon chirality by external fields is still lacking. Here, we propose that indisplacement-type ferroelectric materials, an external electric field canreverse the chirality of chiral phonons via ferroelectric switching. Usingfirst-principles calculations, we demonstrate this point in the well knowntwo-dimensional ferroelectric In$_2$Se$_3$. This reversal may lead to a numberof electrically switchable phenomena, such as chiral phonon inducedmagnetization, phonon Hall effect, and possible interface phonon modes atferroelectric domain boundaries. Our work offers a new way to control chiralphonons, which could be useful for the design of thermal or information devicesbased on them.

Electrically Controllable Chiral Phonons in Ferroelectric Materials