Ferroelectricity-Driven Phonon Berry Curvature and Nonlinear Phonon Hall Transports
Ferroelectricity-Driven Phonon Berry Curvature and Nonlinear Phonon Hall Transports
Berry curvature (BC) governs topological phases of matter and generates anomalous transport. When a magnetic field is applied, phonons can acquire BC indirectly through spin-lattice coupling, leading to a linear phonon Hall effect. Here, we show that polar lattice distortion directly couples to a phonon BC dipole, which causes a …