School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.
Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing, 100044, China.
Nanoscale. 2023 Feb 16;15(7):3300-3308. doi: 10.1039/d2nr06919a.
Low-temperature solution-made chiral lead halide perovskites (LHPs) have spontaneous Bychkov-Rashba spin orbit coupling (SOC) and chiral-induced spin selectivity (CISS) qualities. Their coexistence may give rise to considerable spin and charge conversion capabilities for spin-orbitronic applications. In this study, we demonstrate the spin-photogalvanic effect for (-MBA)PbI and (-MBA)PbI polycrystalline film-based lateral devices (100 μm channel length). The light helicity dependence of the short-circuit photocurrent exhibits the circular photogalvanic effect (CPGE) and linear photogalvanic effect (LPGE) with decent two-fold symmetry for a complete cycle in a wide temperature range from 4 K to 300 K. Because of the Rashba SOC and the material helicity, the effect is converse for the two chiral LHPs. In addition, its magnitude and sign can be effectively tuned by constant magnetic fields. The Rashba effect, CISS-generated unbalanced spin transport, and chiral-induced magnetization are mutually responsible for it. Our study evidently proves the future prospect of using chiral LHPs for spin-orbitronics.
低温溶液法制备的手性卤化铅钙钛矿（LHPs）具有自发的拜科夫-拉什巴自旋轨道耦合（SOC）和手性诱导自旋选择（CISS）性质。它们的共存可能为自旋轨道电子学应用带来相当大的自旋和电荷转换能力。在这项研究中，我们展示了基于（-MBA）PbI 和（-MBA）PbI 多晶薄膜的横向器件（100μm 沟道长度）的自旋光电流效应。短路光电流的光螺旋依赖性表现出圆光电离效应（CPGE）和线光电离效应（LPGE），在从 4K 到 300K 的很宽温度范围内，完整循环的二倍对称性相当好。由于 Rashba SOC 和材料螺旋性，两种手性 LHPs 的效果相反。此外，其幅度和符号可以通过恒定磁场有效地调节。Rashba 效应、CISS 产生的不平衡自旋输运和手性诱导磁化相互作用，共同导致了这一现象。我们的研究清楚地证明了手性 LHPs 在自旋轨道电子学中的未来前景。
