  Hexagonal two-dimensional materials with broken inversion symmetry (as BN or
transition metal dichalcodenides) are known to sustain chiral phonons with
finite angular momentum, adding a further useful degree of freedom to the
extraordinary entangled (electrical, optical, magnetic and mechanical)
properties of these compounds. However, because of lattice symmetry
constraints, such chiral modes are constrained to the corners of the Brillouin
zone, allowing little freedom for manipulating the chiral features. In this
work, we show how the application of uniaxial strain leads to the existence of
new chiral modes in the vicinity of the zone center. We also show that such
strain-induced chiral modes, unlike the ones pinned at the K points, can be
efficiently manipulated by modifying the strain itself, which determines the
position of these modes in the Brillouin Zone. The results of the present paper
add a new technique for the engineering of the quantum properties of
two-dimensional lattices.
