Guo Wuqian, Xu Haojie, Ma Yu, Liu Yi, Gao Heng, Hu Tao, Ren Wei, Luo Junhua, Sun Zhihua
State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Angew Chem Int Ed Engl. 2023 Apr 17;62(17):e202300028. doi: 10.1002/anie.202300028. Epub 2023 Mar 13.
As a momentum-independent spin configuration, persistent spin texture (PST) could avoid spin relaxation and play an advantageous role in spin lifetime. Nevertheless, manipulation of PST is a challenge due to the limited materials and ambiguous structure-property relationships. Herein, we present electrically switchable PST in a new 2D perovskite ferroelectric, (PA) CsPb Br (where PA is n-pentylammonium), which has a high Curie temperature of 349 K, evident spontaneous polarization (3.2 μC cm ) and a low coercive electric field of 5.3 kV cm . The combination of symmetry-breaking in ferroelectrics and effective spin-orbit field facilitates intrinsic PST in the bulk and monolayer structure models. Strikingly, the directions of spin texture are reversible by switching the spontaneous electric polarization. This electric switching behavior relates to the tilting of PbBr octahedra and the reorientation of organic PA cations. Our studies on ferroelectric PST of 2D hybrid perovskites afford a platform for electrical spin texture manipulation.
作为一种与动量无关的自旋构型，持久自旋纹理（PST）可以避免自旋弛豫，并在自旋寿命方面发挥有利作用。然而，由于材料有限以及结构-性能关系不明确，对PST的操控是一项挑战。在此，我们在一种新型二维钙钛矿铁电体（PA）CsPbBr₃（其中PA为正戊基铵）中展示了电可切换的PST，该铁电体具有349 K的高居里温度、明显的自发极化（3.2 μC cm⁻²）以及5.3 kV cm⁻¹的低矫顽电场。铁电体中的对称性破缺与有效的自旋轨道场相结合，有利于在体相和单层结构模型中实现本征PST。引人注目的是，通过切换自发极化，自旋纹理的方向是可逆的。这种电切换行为与PbBr₆八面体的倾斜和有机PA阳离子的重新取向有关。我们对二维杂化钙钛矿铁电PST的研究为电自旋纹理操控提供了一个平台。
