Reversible canted persistent spin textures in two-dimensional ferroelectric bilayer WTe2

The recent discovery of materials hosting persistent spin texture (PST) opens an avenue for the realization of energy-saving spintronics since they support an extraordinarily long spin lifetime. However, the stability of the PST is sensitively affected by symmetry breaking of the crystal induced by external perturbation such as the electric field. In this paper, through first-principles calculations supplemented by symmetry analysis, we report the emergence of the robust and stable PST with large spin splitting in the two-dimensional (2D) ferroelectric bilayer WTe 2. Due to the low symmetry of the crystal ( C s point group), we observe a canted PST in the spin-split bands around the Fermi level displaying a unidirectional spin configuration tilted along the y z plane in the first Brillouin zone. Such a typical PST can be effectively reversed by out-of-plane ferroelectric switching induced by interlayer sliding along the in-plane direction. We further demonstrated that the reversible PST is realized by the application of an out-of-plane external electric field. Thus, our findings uncover the possibility of an electrically tunable PST in 2D materials, offering a promising platform for highly efficient and non-volatile spintronic devices. Published under an exclusive license by AIP Publishing.

Automated summary

The recent discovery of materials hosting persistent spin texture (PST) opens up new possibilities for energy-saving spintronics. However, the stability of PST is affected by symmetry breaking induced by external perturbations like electric fields. In this paper, the authors report the emergence of a stable PST in a two-dimensional ferroelectric bilayer WTe2, which can be effectively controlled by an out-of-plane external electric field. These findings offer a promising platform for highly efficient and non-volatile spintronic devices.