Topological chiral phonons along the line defect of intralayer heterojunctions

As a potential degree of freedom, the chirality of phonons is expected to become a carrier of information. Exploring the phonon mode that can stably maintain chirality along a certain transport path is the basis for its realization. In this work, we find a chiral interface mode that is obviously localized at the line defect in the hexagonal boron nitride intralayer heterojunction, which is topologically protected. The existence of mirror...