Ferroelectric control of a spin-polarized two-dimensional electron gas
Yakui Weng, Wei Niu, Xin Huang, Ming An, Shuai Dong
Abstract
The spin-polarized two-dimensional electron gas (2DEG) at oxide interfaces is an emerging physical phenomenon, which is technologically important for potential device applications. However, most previous relevant studies only focused on the creation and characterization of the spin-polarized 2DEG. To push forward the device applications, the control of a spin-polarized 2DEG by electric field is an important step. Here, a model system based on antiferromagnetic and ferroelectric perovskites, i.e., the ${\mathrm{YTiO}}_{3}/{\mathrm{PbTiO}}_{3}$ superlattice, is designed to manipulate the spin-polarized 2DEG. By switching the direction of polarization, the spin-polarized 2DEG can be effectively tuned for both symmetric interfaces and asymmetric polar interfaces.