Ferroelectric materials with built-in electric fields are useful for ultrafast electronics and solar cells. Using ultrafast electron diffraction, we here report that ferroelectric BaTiO3 reacts to light with a polarization-sensitive electron-phonon coupling. Excited electrons relax faster into phonons and temperature when the optical electric field aligns to the ferroelectric polarization. Also, ultrafast electron electrometry visualizes the motion of photo-excited electron-hole pairs in presence of the ferroelectric field.
@article{arxiv.2603.25521,
title = {Anisotropic light-electron-phonon coupling and ultrafast carrier separation in ferroelectric BaTiO$_3$},
author = {Atal Bihari Swain and Somnath Kale and Rohit Soni and Peter Baum},
journal= {arXiv preprint arXiv:2603.25521},
year = {2026}
}