SPICE Workshop on Ferrons and Magnons: friends or foes? July 7th - 9th, 2026
Jiang Xiao
We demonstrate that ferroelectric domain walls can serve as natural narrow waveguides for ferrons—the collective wave-like excitations of electric polarization in ferroelectrics. Based on the Landau–Khalatnikov–Tani equation, we identify two bound-state ferron modes confined inside domain walls: a symmetric vibration mode with zero frequency gap and an anti-symmetric breathing mode with finite frequency gap. These modes propagate steadily along domain walls and show strong robustness against local impurity pinning, as confirmed by COMSOL numerical simulations. The ferron does not involve electronic charge transport and can propagate in insulating domain walls, operating in the GHz–THz range. Ferron transport in ferroelectric domain walls opens new opportunities for ferroelectric-based information processing devices.