Electrical Switching of Strain Gradients and 90° Domain Walls via Hidden Polar-Acoustic Coupling in PbTiO3RemoveYajun Zhang, Konstantin Shapovalov, Xu He, Chang Liu, Huadong Yong, Xingyi Zhang, Jie Wang, Kun Zhou, and Philippe GhosezPhys. Rev. Lett. 136, 236101 (2026)
