Unlocking Static Polarization and Strain Density Waves in Perovskites by Softening a Hidden Antiferrodistortive Tilt Gradient Mode
This paper establishes a symmetry-driven strategy using first-principles calculations to unlock static polarization and strain density waves in perovskites by softening a hidden antiferrodistortive tilt gradient mode, which triggers a structural transition to a novel phase and enables electrically tunable spin density waves via the flexomagnetic effect.