Dynamical Manipulation\nof Polar Topologies from Acoustic\nPhonon Excitations

Since\nthe recent discovery of polar topologies, a recurrent question\nhas been how to remotely tune them. Many efforts have focused on the\npumping of polar optical phonons from optical methods, but with limited\nsuccess, as only switching between specific phases has been achieved\nso far. Additionally, the correlation between optical pulse characteristics\nand the resulting phase is poorly understood. Here, we propose an\nalternative approach and demonstrate the deterministic and dynamical\ntailoring of polar topologies using acoustic phonon excitations.\nOur second-principles simulations reveal that by pumping specific\nlongitudinal and transverse acoustic phonons, various topological\ntextures can be induced in materials like BaTiO<sub>3</sub> or PbTiO<sub>3</sub>. This method leverages the strong coupling between polarization\nand strain in these materials, enabling predictable and dynamic control\nof polar patterns. Our findings open up an alternative possibility\nfor the manipulation of polar textures, suggesting a promising research\ndirection.