Strain-Induced Modulation of Spin Splitting and Persistent Spin Textures in Low-Symmetry 2D Hybrid Perovskites: A case study of RP phase

Abstract: We report the observation of a persistent spin texture (PST) in pseudo-2D hybrid perovskite, characterized by significant spin splitting strength on the order of (3 \, \text{eV} \cdot \text{\AA}). Using first-principles density functional theory (DFT) calculations, complemented by a (\mathbf{k} \cdot \mathbf{p}) model analysis, we validate the presence of PST and its robustness under various conditions. The material's non-centrosymmetric nature and strong spin-orbit coupling ensure uniform spin orientation in momentum space, enabling long spin lifetimes and promising spintronic applications. Furthermore, we demonstrate the tunability of the spin splitting via the application of external strain and stress, offering a versatile approach to control spin configurations. Our results highlight the potential of this perovskite system for next-generation spintronic devices, where external perturbations can be used to precisely modulate electronic properties.