  As an ideal platform, both the theoretical prediction and first experimental
verification of chiral phonons are based on transition-metal dichalcogenide
materials. The manipulation of phonon chirality in these materials will have a
profound impact on the study of chiral phonons. In this work, we utilize the
sliding ferroelectric mechanism to study the phonon chirality manipulation
mechanism in transition-metal dichalcogenide materials. Based on
first-principles calculations, we study the different effects of interlayer
sliding on the phonon properties in bilayer and four-layer MoS$_2$ sliding
ferroelectrics. We find that sliding can regulate phonon chirality and Berry
curvature, which further affects the phonon angular momentum and magnetization
under a temperature gradient and the phonon Hall effect under a magnetic field.
Our work connects two emerging fields and opens up a new route to manipulate
phonon chirality in transition-metal dichalcogenide materials through the
sliding ferroelectric mechanism.
