Persistent spin textures (PSTs) in solid-state materials arise from a unidirectional spin-orbit field in momentum space and offer a route to deliver the necessary long carrier spin lifetimes utilized in future quantum microelectronic devices. Nonetheless, few bulk materials host PSTs owing to crystal symmetry and chemical requirements, with even fewer experimentally demonstrated examples. This scarcity makes both PST materials discovery and performance assessment challenging. Here, we demonstrate that bulk PSTs exist in the family of layered A₃B₂O₇ oxides and that a persistent spin helix (PSH) occurs over a large region of the Brillouin zone—a feature essential to experimental realization. By solving the spin-diffusion equations in the strong coupling limit and using the PST performance criteria we formulate, we find that the spin lifetime of the PSH is ∼63 ns in Sr₃Hf₂O₇—substantially larger than that predicted (∼10 ns) and demonstrated experimentally (∼600 ps) in GaAs/AlGaAs quantum wells.

固态材料中的持久自旋织构（PST）来自动量空间中的单向自旋轨道场，并提供了一种途径，以提供在未来的量子微电子器件中使用的必要的长载流子自旋寿命。尽管如此，由于晶体的对称性和化学要求，散装材料中很少有PST，通过实验证明的实例更少。这种稀缺性使PST材料的发现和性能评估都具有挑战性。在这里，我们证明了在层状A ₃ B ₂ O ₇族中存在大量PST。氧化物和持久的自旋螺旋（PSH）发生在布里渊区的大区域上-这是实验实现必不可少的功能。通过在强耦合极限下求解自旋扩散方程并使用PST性能准则，我们发现在Sr ₃ Hf ₂ O ₇中，PSH的自旋寿命为〜63 ns-大大大于预测值（〜10 ns），并在GaAs / AlGaAs量子阱中进行了实验（〜600 ps）。