Quantification of Chirality Induced Spin–Orbit Coupling for Long Spin Polarized Lifetime in Hybrid Perovskite
Yuling Huang, Zhikang Jiang, Congcong Chen, Shaokuan Gong, Lingling Mao, Jin-Zhu Zhao, Xihan Chen
Abstract
Long spin lifetimes are crucial for maintaining robust spin states during propagation in spintronic devices. Spin–orbit coupling (SOC) in chiral hybrid perovskites can induce chirality-dependent spin splitting, facilitating the manipulation of spin polarization. In this study, we introduce a chiral organic molecule, ( R / S )-4-(aminoethyl)piperidinium (4AEP), into iodide-lead-based structures to synthesize chiral [( R / S )-4AEP]PbI 4 crystals and thin films. Using circularly polarized pump–probe techniques, we examine the carrier spin dynamics in [( R / S )-4AEP]PbI 4 . Our results demonstrate that chirality-induced spin splitting significantly enhances the spin-polarization lifetime, achieving a spin splitting of approximately 130 meV at the valence band maximum and spin lifetimes exceeding 1 ns. Density functional theory (DFT) calculations reveal that opposite spin states exist in the R - and S -chiral samples with substantial spin splitting. These findings highlight the potential of chiral hybrid perovskites for spintronics applications.