Speaker
Description
The interplay between electron charge, spin, and ferroelectric polarization is under-explored for conducting ferroelectric domain walls. We investigated the electronic band structures of $t_{2g}$ electrons, confined to charged 90$^\circ$ domain walls in barium titanate ($BaTiO_3$), a prototypical perovskite ferroelectric. A key novel aspect of our study is the explicit inclusion of both orbital and spin degrees of freedom in the Hamiltonian. This leads to an Ising-type spin-orbit coupling. We constructed a tight-binding model(TBM) for $t_2g$ electrons that is constrained by symmetries of the domain wall, including time-reversal, mirror, and rotational symmetries. First-principles density functional theory (DFT) calculations were performed to extract the tight binding parameters. Our findings offer new insights into spin-orbit interactions at ferroelectric domain walls and open avenues for their potential use in next-generation electronic and spintronic devices
| Keyword-1 | Charged Domain Walls |
|---|---|
| Keyword-2 | Spin-Orbit Coupling |
| Keyword-3 | Polarization |
